2010 Yamaha Motorsports Big Bear 400 4x4 IRS Owners Manual
2010 Yamaha Motorsports Big Bear 400 4x4 IRS Manual
2010 Yamaha Motorsports Big Bear 400 4x4 IRS manual content summary:
- 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 1
READ THIS MANUAL CAREFULLY! It contains important safety information. OWNER'S MANUAL YFM40FBZ YFM40FBHZ WARNING This ATV should not be ridden by anyone under 16 years of age. LIT-11626-23-28 4S1-F8199-13 - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 2
EBU17092 Read this manual carefully before operating this vehicle. This manual should stay with this vehicle if it is sold. - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 3
of your ATV, please consult a Yamaha dealer. AN IMPORTANT SAFETY MESSAGE: G Read this manual together with TIPS FOR THE ATV RIDER carefully and completely before operating your ATV. Make sure you understand all instructions. G Pay close attention to the warning and notice labels on the ATV. G Never - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 4
CAN RESULT IN SERIOUS INJURY OR DEATH. Particularly important information is distinguished in this manual by the following notations: This is the safety alert symbol. It is used to alert you to potential personal injury hazards. Obey all safety messages - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 5
effect at the time of manufacture. Please check your local riding laws and regulations before operating this ATV. EBU17402 YFM40FBZ/YFM40FBHZ OWNER'S MANUAL ©2009 by Yamaha Motor Corporation, U.S.A. 1st edition, April 2009 All rights reserved. Any reprinting or unauthorized use without the written - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 6
EWB00011 WARNING Indicates a hazardous situation which, if not avoided, could result in death or serious injury. EBU17420 TABLE OF CONTENTS LOCATION OF THE WARNING AND SPECIFICATION LABELS ...1-1 SAFETY INFORMATION ...2-1 DESCRIPTION ...3-1 Left view ...3-1 Right view...3-1 Controls and - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 7
TERRAIN ...7-20 SLIDING AND SKIDDING ...7-21 WHAT TO DO IF...7-22 WHAT TO DO...7-22 PERIODIC MAINTENANCE AND ADJUSTMENT...8-1 Owner's manual and tool kit ...8-1 Periodic maintenance chart for the emission control system ...8-3 General maintenance and lubrication chart ...8-5 Checking the spark plug - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 8
48 Removing a wheel ...8-49 Installing a wheel ...8-50 Troubleshooting ...8-51 Troubleshooting chart ...8-52 CLEANING AND STORAGE ...9-1 Cleaning ...9-1 Storage 11-4 Maintenance record ...11-5 YAMAHA MOTOR CORPORATION, U.S.A. ATV LIMITED WARRANTY ...11-6 YAMAHA EXTENDED SERVICE (Y.E.S.) ...11-8 - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 9
EBU17660 LOCATION OF THE WARNING AND SPECIFICATION LABELS 1 1 2 3 4 5 6 7 8 9 10 1-1 - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 10
EBU17670 1 Read and understand all of the labels on your ATV. These labels contain important information for safe and proper operation. Never remove any labels from your ATV. If a label becomes difficult to read or comes off, request a replacement label from your Yamaha dealer. 1 2 5ND-F4877-30 - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 11
4 6 1 WARNING UNDER 16 Operating this ATV if you are under the age of 16 increases your chance of severe injury or death. 5 7 NEVER operate this ATV if you are under age 16. 1P0-F816L-00 1-3 - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 12
1 8 Certification of Compliance This ATV complies with applicable provisions of ANSI/SVIA 1-2007 and is subject to an approved ATV action plan submitted by YAMAHA and on file with the U.S. Consumer Product safety Commission. YAMAHA MOTOR CORPORATION U.S.A. 10 6555 Katella Avenue, Cypress, - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 13
riding on hills or over obstacles, if you fail to take proper precautions. SEVERE INJURY OR DEATH can result if you do not follow these instructions: G Read this manual and all labels carefully and follow the operating procedures described. G Never operate an ATV without proper training or - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 14
time you use it to make sure it is in safe operating condition. Always follow the inspection and maintenance procedures and schedules described in this manual. Always keep both hands on the handlebars and both feet on the footboards of the ATV during operation. Always go slowly and be extra careful - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 15
ATV in fast flowing water or in water deeper than that recommended in this manual. Remember that wet brakes may have reduced stopping ability. Test your brakes after and securely attached. Reduce speed and follow instructions in this manual for carrying cargo or pulling a trailer. Allow greater distance - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 16
EWB00071 G 2 WARNING Avoid Carbon Monoxide Poisoning All engine exhaust contains carbon monoxide, a deadly gas. Breathing carbon monoxide can cause headaches, dizziness, drowsiness, nausea, confusion, and eventually death. Carbon Monoxide is a colorless, odorless, tasteless gas which may be - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 17
FOR MORE INFORMATION ABOUT ATV SAFETY, call the Consumer Products Safety Commission at 1-800-638-2772, or the ATV Distributor's Safety Hotline at 1-800-852-5344. 2 2-5 - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 18
EBU17680 DESCRIPTION EBU17690 EBU17700 Left view 3 Right view 1 2 3 4 10 1. Front shock absorber assembly spring preload adjusting ring 2. Fuel cock 3. Recoil starter 4. Throttle stop screw 5. Fuses 6. Battery 7. Storage compartment and tool kit 8. Rear shock absorber assembly spring preload - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 19
EBU17712 Controls and instruments TIP The ATV you have purchased may differ slightly from the figures shown in this manual. 3 1. 2. 3. 4. 5. 6. 7. 8. Rear brake lever Parking brake lock plate Starter (choke) Speedometer Reverse knob Auxiliary DC jack Front brake fluid reservoir On-Command four- - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 20
EBU17725 INSTRUMENT AND CONTROL FUNCTIONS EWB00011 WARNING Indicates a hazardous situation which, if not avoided, could result in death or serious injury. 4 EBU17770 Main switch The positions of the main switch are as follows: ON All electrical systems are supplied with power. The headlights, - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 21
EBU17814 Indicator lights and warning light TIP If the indicator light flashes under any other circumstances or the speedometer does not show the speed while riding, have a Yamaha dealer check the speed sensor circuit. EBU17870 Neutral indicator light "NEUTRAL" This indicator light comes on when - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 22
If the warning light stays on, allow the engine to cool. If the warning light stays on when the engine is cool, have a Yamaha dealer check the electrical circuit. ECB00010 TIP Due to the synchronizing mechanism in the differential gear case, the light may not come on until the ATV starts moving. - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 23
4 1. 2. 3. 4. Reset knob Speedometer Odometer Tripmeter 1. Fuel gauge 2. Red line EBU18050 Fuel gauge The fuel gauge indicates the amount of fuel in the fuel tank. When the needle reaches the red line, refill the tank at the first opportunity. TIP If the ATV runs out of fuel, move the fuel - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 24
EBU18061 EBU18101 Handlebar switches Start switch " " Push this switch to crank the engine with the starter. See the starting instructions on page 6-1 prior to starting the engine. EBU18161 4 Light switch " / /OFF" Set this switch to " " to turn on the low beams, the taillight and the - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 25
EBU28510 EWB00150 Override switch "OVERRIDE" WARNING Always ride at a slow speed when the ATV is in four-wheel-drive differential gear lock, and allow extra time and distance for maneuvers. All wheels turn at the same speed when the differential is locked, so it takes more effort to turn the ATV. - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 26
EBU28432 On-Command four-wheel-drive switch "2WD"/"4WD" EWB00163 4 WARNING Always stop the ATV before changing from two-wheel drive to four-wheel drive and vice versa. The ATV handles differently in twowheel drive than in four-wheel drive in some circumstances. Changing from two-wheel drive to - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 27
EBU28372 On-Command differential gear lock switch "4WD"/"LOCK" EWB00131 control and have an accident if you cannot make a sharp enough turn for the speed you are traveling. This ATV is equipped with a switch allowing you to lock the differential gear when in four-wheel drive. Select the - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 28
4 1. On-Command four-wheel-drive switch "2WD"/"4WD" 2. On-Command differential gear lock switch "4WD"/"LOCK" 1. Differential gear lock lever 2. On-Command four-wheel-drive switch "2WD"/"4WD" To lock the differential gear in four-wheel drive, make sure the On-Command four-wheel-drive switch is - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 29
and hold the override switch to disable the differential gear lock speed limiter. (See page 4-6 for a detailed explanation of this switch.) EBU18282 Throttle lever Once the engine is running, pushing the throttle lever will increase the engine speed. Regulate the speed of the ATV by varying the - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 30
Before starting the engine, check the throttle to be sure it is operating smoothly. Make sure it returns to the idle position as soon as the lever is released. EBU18323 Speed limiter 4 Your ATV is equipped with an adjustable speed limiter. The speed limiter keeps the throttle from fully opening, - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 31
4 1. Front brake lever EBU18442 1. Brake pedal Brake pedal and rear brake lever The brake pedal is located on the right side of the ATV and the rear brake lever is located on the left handlebar. To apply the rear brake, push down on the brake pedal or pull the brake lever toward the handlebar - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 32
EBU18460 Parking brake Use the parking brake before starting the engine or parking the ATV, especially on a slope. Apply the rear brake lever and push down the lock plate to apply the parking brake. Squeeze the rear brake lever to release the parking brake. 4 G Always be sure you have released - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 33
4 1. Shift pedal EBU18641 1. Reverse knob "REV" EBU27610 Reverse knob "REV" The reverse knob is used to shift into reverse. See the "Operating the reverse knob and driving in reverse" section on page 6-3 before operating this ATV in reverse. Recoil starter Firmly grasp the handle and pull - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 34
WARNING Gasoline and gasoline vapors are extremely flammable. To avoid fires and explosions and to reduce the risk of injury when refueling, follow these instructions. 1. Before refueling, turn off the engine and be sure that no one is sitting on the vehicle. Never refuel while smoking, or while in - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 35
of sparks, open flames, or other sources of ignition such as the pilot lights of water heaters and clothes dryers. 2. Do not overfill the fuel tank. When refueling, be sure to insert the pump nozzle into the fuel tank filler hole. Stop filling when the fuel reaches the bottom of the filler tube. - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 36
not exceed 10% (E10). Gasohol containing methanol is not recommended by Yamaha because it can cause damage to the fuel system or vehicle performance problems. Fuel cock The fuel cock supplies fuel from the tank to the carburetor while also filtering it. The fuel cock lever positions are explained - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 37
ON RES 4 1. Arrow mark positioned over "ON" 1. Arrow mark positioned over "RES" With the fuel cock lever in this position, fuel flows to the carburetor. Turn the fuel cock lever to this position when starting the engine and riding. This indicates reserve. With the fuel cock lever in this - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 38
Move the starter (choke) in direction (b) to turn off the starter (choke). See the "Starting a cold engine" section on page 6-1 for proper operation. 4 1. Seat lock lever 1. Starter (choke) " EBU18881 " To install the seat Insert the projections on the front of the seat into the seat holders - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 39
4 1. Seat holder 2. Projection EBU18902 1. Storage compartment G G Storage compartment ECB00130 Do not exceed the load limit of 2.0 kg (4 lb) for the storage compartment. Do not exceed the maximum load of 210.0 kg (463 lb) for the ATV. NOTICE Do not store metal or sharply edged objects, like - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 40
EBU18972 Rear carrier G G Do not exceed the load limit of 80.0 kg (176 lb) for the rear carrier. Do not exceed the maximum load of 210.0 kg (463 lb) for the ATV. EBU19145 4 Adjusting the front and rear shock absorber assemblies The spring preload can be adjusted to suit the rider's weight and - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 41
EBU19181 Auxiliary DC jack The auxiliary DC jack is located at the front right side of the ATV. The auxiliary DC jack can be used for suitable work lights, radios, etc. The auxiliary DC jack should only be used when the engine is running. 1. Set the light switch to "OFF". 2. Start the engine. (See - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 42
Maximum rated capacity for the auxiliary DC jack: DC 12 V, 10 A (120 W) 4. When the auxiliary DC jack is not being used, cover it with the cap. ECB00120 4 NOTICE G Do not use accessories requiring more than the above maximum capacity. This may overload the circuit and cause the fuse to blow. G If - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 43
inspection and maintenance procedures and schedules described in the Owner's Manual. EWB00481 WARNING Failure to inspect or maintain the vehicle operate the vehicle if you find any problem. If a problem cannot be corrected by the procedures provided in this manual, have the vehicle inspected by a - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 44
ITEM Rear brake ROUTINE Check operation, and correct if necessary. Lubricate cables if necessary. Check lever and pedal free play, and adjust if necessary. Make sure that operation is smooth. Lubricate cable and lever housing if necessary. Check cable free play, and adjust if necessary. Make sure - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 45
EBU19541 Fuel Make sure that there is sufficient fuel in the tank. (See page 4-15.) EBU19560 G G Engine oil Make sure that the engine oil is at the specified level. Add oil as necessary. (See page 8-11.) EBU19590 Check for correct free play in the rear brake lever and brake pedal. If the free - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 46
Brake operation Test the brakes at slow speed after starting out to make sure they are working properly. If the brakes do not provide proper braking performance, check the brake pads and friction plates for wear. (See page 8-27.) EBU19761 pressure below the minimum specified could also cause the - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 47
5 1. Low-pressure tire gauge 1. Tire wear limit Tire wear limit When the tire groove decreases to 3 mm (0.12 in) due to wear, replace the tire. Tire information This ATV is equipped with tubeless tires with valves. EWB02551 WARNING Use of improper tires on this ATV may cause loss of control, - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 48
5 Front: Manufacturer/model: ITP/MUD LITE Size: AT25 x 8-12 Type: Tubeless Rear: Manufacturer/model: ITP/MUD LITE Size: AT25 x 10-12 Type: Tubeless Aftermarket tires and rims The tires and rims that came with your ATV were designed to match the performance capabilities and to provide the best - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 49
EBU19872 OPERATION EWB00011 WARNING Indicates a hazardous situation which, if not avoided, could result in death or serious injury. EBU19901 Read the Owner's Manual carefully before riding the ATV. If there is a control or function you do not understand, ask your Yamaha dealer. EWB00631 1. Set - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 50
Position (3): Cold engine start with ambient temperature above 25 °C (80 °F). Ambient temp./starter (choke) position TIP If the engine fails to start, release the start switch, then push it again. Pause a few seconds before the next attempt. Each cranking should be as short as possible to preserve - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 51
EBU20291 Starting a warm engine Follow the same procedure as for starting a cold engine, with the exception that the starter (choke) is not required when the engine is warm. Instead, start the engine with the throttle slightly open. EBU20481 2. While applying the rear brake lever or brake pedal, - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 52
4. Check behind you for people or obstacles, and then release the rear brake lever or brake pedal. 5. Open the throttle lever gradually and continue to watch to the rear while backing. EBU20541 Shifting This ATV has a 5-speed forward and 1-speed reverse transmission with a centrifugal, automatic - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 53
3. Open the throttle gradually. WARNING! Always open the throttle gradually. Opening the throttle abruptly would increase the chance of an accident. It could make the ATV wheelie or overturn. [EWB00741] 4. Once the ATV has attained adequate speed, release the throttle lever. 5. Shift into second - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 54
throttle at any time. 320 km (200 mi) or 20 hours and beyond The ATV can now be operated normally. ECB00220 NOTICE If any engine trouble should occur during the engine break-in period, immediately have a Yamaha dealer check the ATV. EBU20722 Parking When parking the ATV, shift into first gear - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 55
EBU20840 Parking on a slope EWB00850 WARNING Avoid parking on hills or other inclines. Parking on a hill or other incline could cause the ATV to roll out of control, increasing the chance of an accident. If you must park on an incline, place the ATV transversely across the incline, shift into - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 56
Yamaha or modifications not specifically recommended by Yamaha, even if sold and installed by a Yamaha dealer. Aftermarket parts, accessories, and modifications While you may find aftermarket products similar in design and quality to genuine Yamaha Accessories, recognize that some aftermarket - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 57
G Never exceed the weight limits shown. An overloaded ATV can be unstable. MAXIMUM LOADING LIMIT ATV loading limit (total weight of rider, cargo, accessories, and tongue): 210.0 kg (463 lb) Front carrier: 40.0 kg (88 lb) Rear carrier: 80.0 kg (176 lb) Storage compartment: 2.0 kg (4 lb) Trailer - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 58
EWB00011 WARNING Indicates a hazardous situation which, if not avoided, could result in death or serious injury. 6 6-10 - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 59
EBU21132 RIDING YOUR ATV 7 7-1 - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 60
Before you begin to ride, be sure you have read this Owner's Manual completely and understand the operation of the controls. Pay partic- G G WARNING not operate this ATV or allow anyone else to operate it without proper instruction. The risk of an accident is greatly increased if the operator does - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 61
niques described in this Owner's Manual. For more information about the training course, contact an authorized ATV dealer or call 1-800-887-2887. Riding your ATV requires skills acquired through practice - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 62
7 Apparel Always wear the following to reduce risk of injury in an accident: G Approved motorcycle helmet that fits properly G Eye protection (goggles, helmet face shield, or protective eyewear) G Over-the-ankle boots, gloves, long-sleeved shirt or jacket, and long pants An approved helmet and - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 63
. Perform the pre-operation checks listed on page 5-1. Always follow the inspection and maintenance procedures and schedules described in the Owner's Manual. WARNING! Failure to inspect the ATV before operating it and to maintain it properly increases the possibility of an accident or equipment - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 64
of control, an overturn, or other accident. To reduce the risk of an accident: 7-6 Take extra precautions when driving with a load or trailer. Follow these instructions and always use common sense and good judgment when carrying cargo or towing a trailer. - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 65
MAXIMUM LOADING LIMIT ATV loading limit (total weight of cargo, rider, accessories, and tongue): 210.0 kg (463 lb) Front carrier: 40.0 kg (88 lb) Rear carrier: 80.0 kg (176 lb) Storage compartment: 2.0 kg (4 lb) Trailer hitch: Pulling load (total weight of trailer and cargo): 4900 N (500 kgf, 1102 - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 66
this ATV should be genuine Yamaha or equivalent components designed for use on this ATV and should be installed and used according to instructions. If you have questions, consult an authorized ATV dealer. WARNING! Operating this ATV with improper 7-8 WARNING Dry grass or brush or other combustible - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 67
erating in areas where combustible materials may have collected. Do not idle or park the vehicle in long dry grass or other dry ground cover. To prevent burns, avoid touching the exhaust system. Park the ATV in a place where pedestrians or children are not likely to touch it. BE CAREFUL WHERE YOU - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 68
WARNING! Never operate this ATV on any public street, road or highway, even a dirt or gravel one. You could collide with another vehicle. [EWB01031] 7 Do not operate on rough, slippery, or loose terrain until you have learned and practiced the skills necessary to control the ATV on such terrain. - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 69
When riding in an area where you might not easily be seen, such as desert terrain, mount a caution flag on the ATV. DO NOT use the flag pole bracket as a trailer hitch. WARNING! You could collide with another vehicle if operating in off-road areas where you cannot easily be seen. Mount a caution - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 70
area before trying more difficult terrain. Set the parking brake and follow the instruction on page 6-1 to start the engine. Once it has warmed up you Always follow proper procedures for turning as described in this Owner's Manual. Practice turning at low speeds before attempting to turn at faster - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 71
will let the wheel on the inside of the turn slip slightly, allowing the ATV to make the turn properly. 1. Lean towards inside of turn. 2. Support your weight on the outer footboard. 7 This procedure should be practiced at slow speed many times in a large off-road area with no obstacles. If - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 72
or loss of control. Use proper riding techniques described in this Owner's Manual. G Never operate the ATV on hills too steep for the ATV or hill until you have mastered the turning technique as described in the Owner's Manual on level ground. Be very careful when turning on any hill. Avoid crossing - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 73
Do not attempt to climb hills until you have mastered basic maneuvers on flat ground. Always check the terrain carefully before attempting any hill. In all cases avoid inclines with slippery or loose surfaces, or obstacles that might cause you to lose control. To climb a hill, you need traction, - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 74
side, or to a side if pointed straight uphill. Turn the 7-16 ATV around and remount, following the procedure described in the Owner's Manual. WARNING! Stalling, rolling backwards or improperly dismounting while climbing a hill could result in ATV overturning. If you cannot control the ATV, dismount - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 75
G G G G G G Always check the terrain carefully before you start down any hill. Never operate the ATV on hills too steep for the ATV or for your abilities. The ATV can overturn more easily on extremely steep hills than on level surfaces or small hills. Shift your weight backward and to the up side - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 76
of the ATV. Never attempt to turn the ATV around on any hill until you have mastered the turning technique as described in the Owner's Manual on level ground. Be very careful when turning on any hill. 7 CROSSING A SLOPE EWB01632 WARNING Improperly crossing hills or turning on hills could cause - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 77
of drowning or other injuries, use care when crossing through water. Never operate this ATV water deeper than the depth specified in your Owner's Manual, as tires may float, increasing the risk of an overturn. 7-19 Test your brakes after leaving the water. If necessary, apply them several times - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 78
ride over large obstacles, such as large rocks or fallen trees. When you go over obstacles, always follow proper procedures as described in the Owner's Manual. Riding over rough terrain should be done with caution. Look out for obstacles which could cause damage to the ATV or could lead to an - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 79
cident. Be sure to keep your feet firmly mounted on the footboards at all times. Avoid jumping the ATV as loss of control and damage to the ATV may result. SLIDING AND SKIDDING EWB01662 WARNING Skidding or sliding improperly may cause you to lose control of this ATV. You may also regain traction - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 80
avoided on extremely slippery surfaces such as ice, since all control may be lost. WHAT TO DO IF...This section is designed to be a reference guide only. Be sure to read each section on riding techniques completely. WHAT TO DO...If your ATV doesn't turn when you want it to: Bring - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 81
G G If your ATV is traversing a sloping surface: Be sure to ride with your weight positioned towards the uphill side of the ATV to maintain proper balance. If the ATV starts to tip, steer down the hill (if there are no obstacles in your way) to regain balance. If you discover that the ATV is going - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 82
service, have a Yamaha dealer perform the service. EWB02561 The intervals given in the periodic maintenance and lubrication chart should be considered as a general guide NEED TO BE SHORTENED. EBU21712 Owner's manual and tool kit Be sure to put this owner's manual in the plastic bag and always carry - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 83
The service information included in this manual and the tools provided in the owner's tool kit are intended to assist you in the the tools or experience required for a particular job, have a Yamaha dealer perform it for you. 1. Owner's manual 8 1. Owner's tool kit 2. Low-pressure tire gauge 8-2 - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 84
EBU21743 Periodic maintenance chart for the emission control system TIP For ATVs not equipped with an odometer or an hour meter, follow the month maintenance intervals. G For ATVs equipped with an odometer or an hour meter, follow the km (mi) or hours maintenance intervals. However, keep in mind - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 85
INITIAL NO. ITEM CHECK OR MAINTENANCE JOB Whichever comes first month km (mi) hours 6 7 * Exhaust system Spark arrester • Check for leakage and replace gasket(s) if necessary. • Check for looseness and tighten all screw clamps and joints if necessary. • Clean. 1 320 (200) 20 3 1300 (800) 80 6 EVERY - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 86
EBU21865 General maintenance and lubrication chart TIP For ATVs not equipped with an odometer or an hour meter, follow the month maintenance intervals. G For ATVs equipped with an odometer or an hour meter, follow the km (mi) or hours maintenance intervals. However, keep in mind that if the ATV isn - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 87
INITIAL NO. ITEM CHECK OR MAINTENANCE JOB Whichever comes first month km (mi) hours 5 6 * * Brake hoses Wheels • Check for cracks or other damage, and replace if necessary. • Replace. • Check runout and for damage, and replace if necessary. • Check tread depth and for damage, and replace if - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 88
INITIAL NO. ITEM CHECK OR MAINTENANCE JOB Whichever comes first month km (mi) hours 17 18 19 20 Engine oil Engine oil filter element Engine oil strainer Differential gear oil • Change. • Check ATV for oil leakage, and correct if necessary. • Clean or replace if necessary. • Clean. • Change. • Check - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 89
if you are riding in unusually wet, dusty, sandy or muddy areas, or at full-throttle. G Hydraulic brake service • Regularly check and, if necessary, correct the brake fluid level. • Every two years replace the internal components of the brake master cylinder and calipers, and - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 90
EWB00011 WARNING Indicates a hazardous situation which, if not avoided, could result in death or serious injury. EBU23212 Checking the spark plug The spark plug is an important engine component, which is easy to check. Since heat and deposits will cause any spark plug to slowly erode, the spark - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 91
ATV is ridden normally). TIP If the spark plug shows a distinctly different color, the engine could be operating improperly. Do not attempt to diagnose such problems yourself. Instead, have a Yamaha dealer check the ATV. 8 1. Spark plug gap Spark plug gap: 0.6-0.7 mm (0.024-0.028 in) 8-10 - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 92
To install the spark plug 1. Clean the surface of the spark plug gasket and its mating surface, and then wipe off any grime from the spark plug threads. 2. Install the spark plug with the spark plug wrench, and then tighten it to the specified torque. Tightening torque: Spark plug: 17.5 Nm (1.75 m· - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 93
1. Engine oil filler cap 4. Insert the dipstick into the filler hole (without screwing it in), and then remove it again to check the oil level. TIP The engine oil should be between the minimum and maximum level marks. 1. Engine oil dipstick 2. Maximum level mark 3. Minimum level mark 5. If the - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 94
2. Start the engine, warm it up for several minutes, and then turn it off. 3. Place an oil pan under the engine to collect the used oil. 4. Remove the engine oil filler cap, and then remove the engine oil drain bolt to drain the oil from the crankcase. NOTICE: When removing the engine oil drain bolt - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 95
Tightening torque: Oil filter element cover bolt: 10 Nm (1.0 m·kgf, 7.2 ft·lbf) 10. Install the oil strainer, compression spring, Oring and engine oil drain bolt. Tighten the engine oil drain bolt to the specified torque. NOTICE: Before installing the engine oil drain bolt, be sure to install the O- - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 96
Recommended oil: See page 10-1. Oil quantity: Without oil filter element replacement: 2.90 L (3.07 US qt, 2.55 Imp.qt) With oil filter element replacement: 3.00 L (3.17 US qt, 2.64 Imp.qt) TIP Be sure to wipe off spilled oil on any parts after the engine and exhaust system have cooled down. ECB00300 - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 97
2. Remove the final gear case guard by removing the bolts. 1. Final gear oil filler bolt 2. Correct oil level 3. Final gear oil 3. If the oil is below the brim of the filler hole, add sufficient oil of the recommended type to raise it to the correct level. 4. Install the oil filler bolt, and then - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 98
1. Final gear oil drain bolt 5. Install the drain bolt, and then tighten it to the specified torque. 8 Tightening torque: Final gear oil drain bolt: 24 Nm (2.4 m·kgf, 17 ft·lbf) 6. Refill with the recommended final gear oil to the brim of the filler hole as shown. NOTICE: Be sure no foreign - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 99
Tightening torque: Final gear oil filler bolt: 24 Nm (2.4 m·kgf, 17 ft·lbf) 8. Check the final gear case for oil leakage. If oil is leaking, check for the cause. 9. Install the final gear case guard by installing the bolts and tightening them to the specified torque. Tightening torque: Final gear - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 100
4. Install the oil filler bolt, and then tighten it to the specified torque. Tightening torque: Differential gear oil filler bolt: 23 Nm (2.3 m·kgf, 17 ft·lbf) To change the differential gear oil 1. Place the ATV on a level surface. 2. Place an oil pan under the differential gear case to collect the - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 101
Recommended differential gear oil: See page 10-1. 6. Install the oil filler bolt, and then tighten it to the specified torque. Tightening torque: Differential gear oil filler bolt: 23 Nm (2.3 m·kgf, 17 ft·lbf) 7. Check the differential gear case for oil leakage. If oil is leaking, check for the - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 102
1. Air filter case cover 2. Air filter case cover holder 1. Air filter element assembly 4. Pull the air filter element assembly out of the air filter case. 8 5. Remove the sponge material from the air filter element. 8-21 - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 103
1. Air filter element 2. Sponge material 6. Clean the sponge material with water or solvent. WARNING! When using solvent to clean the sponge material, always use parts cleaning solvent or water. Never use low-flash-point solvents or gasoline to clean the sponge material because the engine could - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 104
12. Install the seat. TIP The air filter element should be cleaned every 20- 40 hours. It should be cleaned more often if the ATV is operated in extremely dusty areas. Each time the air filter element maintenance is performed, check the air inlet of the air filter case for obstructions. Check the - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 105
1 2 1. Bolt 2. Tailpipe 1. Tailpipe 2. Spark arrester 2. Remove the tailpipe by pulling it out of the muffler. 3. Tap the tailpipe lightly, and then use a wire brush to remove any carbon deposits from the spark arrester portion of the tailpipe and inside of the tailpipe housing. 4. Insert the - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 106
EWB02340 ECB00480 WARNING Do not start the engine when cleaning the spark arrester, otherwise it could cause injury to the eyes, burns, carbon monoxide poisoning, possibly leading to death, and start a fire. Always let the exhaust system cool prior to touching exhaust components. EBU23940 NOTICE - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 107
3. Check the engine idling speed and, if necessary, adjust it to specification by turning the throttle stop screw at the carburetor. To increase the engine idling speed, turn the throttle stop screw in direction (a), and to decrease it, turn the screw in direction (b). TIP If the specified idling - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 108
by a Yamaha dealer. EWB02571 8 4. Tighten the locknut. 5. Slide the rubber cover to its original position. EBU24060 WARNING Operating with improperly serviced or adjusted brakes could lead to a loss in braking ability and an accident. EBU28413 Valve clearance The valve clearance changes with use - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 109
TIP This ATV is equipped with a wet, multiple-disc type rear brake, which is located inside of the final gear case. EBU24171 TIP The wheels need to be removed to check the brake pads. (See page 8-49.) EBU28421 Front brake pads Check each front brake pad for damage and measure the lining thickness. - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 110
1. Wear indicator 2. Wear limit mark EBU24252 1. Minimum level mark 8 Checking the brake fluid level Insufficient brake fluid may allow air to enter the brake system, possibly causing it to become ineffective. Before riding, check that the brake fluid is above the minimum level mark and replenish - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 111
G G G G Refill with the same type of brake fluid. Mixing fluids may result in a harmful chemical reaction and lead to poor braking performance. Be careful that water does not enter the brake fluid reservoir when refilling. Water will significantly lower the boiling point of the fluid and may - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 112
The brake pedal free play should measure 16.0- 19.0 mm (0.63-0.75 in). The brake lever free play should measure 8.0-10.5 mm (0.31-0.41 in). If either free play is incorrect, adjust it as follows. TIP Always perform this maintenance completely in the following order whenever adjusting the rear brake. - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 113
1. Locknut 2. Brake lever free play adjusting bolt 1. Brake lever free play adjusting nut 2. Fully loosen the brake lever free play adjusting nut on the brake cable at the final gear case. 3. Push the brake camshaft lever in direction (a) until it stops [apply approximately 47 N (4.7 kgf, 10.6 - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 114
1. Brake pedal free play adjusting nut 2. Brake camshaft lever 3. Gap "A" 1. Brake lever free play adjusting nut 2. Brake camshaft lever 3. Gap "B" 8 4. Push the brake camshaft lever in direction (a) until it stops [apply approximately 47 N (4.7 kgf, 10.6 lbf) of force], and then turn the brake - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 115
EBU24230 Axle boots The axle boots must be checked for damage at the intervals specified in the periodic maintenance and lubrication chart. Check the axle boots for tears or damage. If any damage is found, have them replaced by a Yamaha dealer. 1. Locknut 2. Brake lever free play adjusting bolt - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 116
Turn the adjusting nut while holding the brake light switch in place. To make the brake light come on earlier, turn the adjusting nut in direction (a). To make the brake light come on later, turn the adjusting nut in direction (b). 1. Rear axle boot (each side) EBU24740 Brake light switches 8 The - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 117
TIP When tightening the locknut, hold the adjusting screw with a screwdriver so that the adjusting screw does not turn together with the locknut. EBU24901 Checking and lubricating the cables The operation and the condition of all control cables should be checked before each ride, and the cables and - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 118
EWB02581 G G WARNING Inspect cables frequently and replace if damaged. Corrosion can result when the cable sheaths become damaged, and cables can also become frayed or kinked, which could restrict the operation of controls and lead to an accident or injury. Always make sure all control cables - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 119
Rear brake lever Brake pedal EBU28841 Shift pedal Checking and lubricating the brake and shift pedals The operation of the brake and shift pedals should be checked before each ride, and the pedal pivots should be lubricated if necessary. Recommended lubricant: Lithium-soap-based grease 8 8-38 - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 120
EBU24963 Checking the wheel hub bearings The front and rear wheel hub bearings must be checked at the intervals specified in the periodic maintenance and lubrication chart. If there is play in a wheel hub or if a wheel does not turn smoothly, have a Yamaha dealer check the wheel hub bearings. - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 121
EBU29184 Battery This model is equipped with a VRLA (Valve Regulated Lead Acid) battery. There is no need to check the electrolyte or to add distilled water. However, the battery lead connections need to be checked and, if necessary, tightened. ECB00620 NOTICE Never attempt to remove the battery - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 122
EWB02160 8 WARNING Battery electrolyte is poisonous and dangerous, as it contains sulfuric acid, which can cause severe burns. Avoid contact with skin, eyes or clothing. Always shield your eyes when working near batteries. Antidote: EXTERNAL: Flush with water. INTERNAL: Drink large quantities of - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 123
To charge the battery Have a Yamaha dealer charge the battery as soon as possible if it seems to have discharged. Keep in mind that the battery tends to discharge more quickly if the ATV is equipped with optional electrical accessories. ECB00930 ECB00940 NOTICE Always keep the battery charged. - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 124
EBU28861 Replacing a fuse 1. Positive battery lead (red) 2. Negative battery lead (black) 8 3. Install the battery holding plate by installing the bolts. 4. Install the seat. (See page 4-19.) 1. 2. 3. 4. 5. Main fuse Spare main fuse Spare fuse Four-wheel-drive motor fuse Fuse box 8-43 - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 125
ECB00640 NOTICE To prevent accidental short-circuiting, turn off the main switch when checking or replacing a fuse. 2. Remove the blown fuse, and then install a new fuse of the specified amperage. WARNING! Always use a fuse of the specified rating, and never use a substitute object in place of the - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 126
Specified fuses: Main fuse: 30.0 A Headlight fuse: 15.0 A Ignition fuse: 15.0 A Four-wheel-drive motor fuse: 10.0 A Auxiliary DC jack fuse: 10.0 A Carburetor warmer fuse: 10.0 A 8 3. Turn the key to "ON" and turn on the electrical circuits to check if the devices operate. 4. If the fuse immediately - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 127
1. Headlight beam adjusting screw 2. Headlight unit screw 1. Headlight bulb holder cover 4. Remove the headlight bulb holder cover by pulling it off. 5. Remove the headlight bulb holder by pushing it in and turning it counterclockwise. 8 1. Headlight bulb holder 8-46 - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 128
6. Remove the burnt-out bulb by pulling it out. 7. Insert a new headlight bulb into the bulb holder. NOTICE: Do not touch the glass part of the headlight bulb to keep it free from oil, otherwise the transparency of the glass, the luminosity of the bulb, and the bulb life will be adversely affected. - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 129
1. Headlight beam adjusting screw EBU25632 1. Storage compartment 2. Nut Replacing the tail/brake light bulb If the tail/brake light bulb burns out, replace it as follows. 1. Open the storage compartment. (See page 4-20.) 2. Remove the tail/brake light assembly by removing the nuts together with - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 130
1. Tail/brake light bulb holder 2. Tail/brake light assembly 1. Tail/brake light bulb holder 2. Tail/brake light bulb 8 4. Remove the burnt-out bulb by pushing it in and turning it counterclockwise. 5. Insert a new bulb into the bulb holder, push it in, and then turn it clockwise until it stops. - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 131
G Tapered nuts are used for both the front and rear wheels. Install the nuts with their tapered side towards the wheel. 1. Wheel nut 3. Elevate the ATV and place a suitable stand under the frame. 4. Remove the nuts from the wheel. 5. Remove the wheel. EBU25701 1. Arrow mark 8 Installing a - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 132
trouble may occur during operation. Any problem in the fuel, compression, or ignition systems, for example, can cause poor starting and loss of power. The following troubleshooting parts, but they are often inferior, have a shorter service life and can lead to expensive repair bills. EWB02280 1. - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 133
EBU25751 Troubleshooting chart 1. Fuel There is enough fuel. Check the fuel level in the fuel tank. There is no fuel. Supply fuel. Check the compression. The engine - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 134
EBU25860 CLEANING AND STORAGE EBU25881 Cleaning Frequent, thorough cleaning of your ATV will not only enhance its appearance but will improve its general performance and extend the useful life of many components. 1. Before cleaning the ATV: a. Block off the end of the exhaust pipe to prevent water - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 135
presence of ammonia) and areas where strong chemicals are stored. [ECB00721] Long-term Before storing your ATV for several months: 1. Follow all the instructions in the "Cleaning" section of this chapter. 2. Turn the fuel cock lever to "OFF". 3. Drain the carburetor float chamber by loosening the - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 136
ly, turn the wheels a little every month in order to prevent the tires from becoming degraded in one spot. 8. Cover the muffler outlet with a plastic bag to prevent moisture from entering it. 9. Remove the battery and fully charge it. Store it in a cool, dry place and charge it once a month. Do not - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 137
cylinder Displacement: 387 cm³ Bore × stroke: 83.0 × 71.5 mm (3.27 × 2.81 in) 10 0 10 30 50 70 90 110 130 ˚F Recommended engine oil grade: API service SG type or higher, JASO standard MA 10-1 - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 138
Engine oil quantity: Without oil filter element replacement: 2.90 L (3.07 US qt, 2.55 Imp.qt) With oil filter element replacement: 3.00 L (3.17 US qt, 2.64 Imp.qt) Spark plug (s): Manufacturer/model: NGK/DR8EA Spark plug gap: 0.6-0.7 mm (0.024-0.028 in) Final gear oil: Type: Yamaha Friction - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 139
Reverse gear: 22/17 × 35/15 (3.020) Chassis: Frame type: Steel tube frame Caster angle: 4.0 ° Trail: 21.0 mm (0.83 in) Rear: 25.0 kPa (0.250 kgf/cm², 3.6 psi) Minimum: Front: 22.0 kPa (0.220 kgf/cm², 3.2 psi) Rear: 22.0 kPa (0.220 kgf/cm², 3.2 psi) Front wheel: Wheel type: Panel wheel Rim size: - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 140
Front suspension: Type: Double wishbone Spring/shock absorber type: Coil spring/oil damper Wheel travel: 147 mm (5.8 in) Rear suspension: Type: Double wishbone Spring/shock absorber type: Coil spring/oil damper Wheel travel: 192 mm (7.6 in) Tail/brake light: 12 V, 5.0/21.0 W × 1 Meter lighting: 12 - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 141
EBU25981 CONSUMER INFORMATION EBU26012 EBU26020 Identification numbers Record the key identification number, vehicle identification number and model label information in the spaces provided below for assistance when ordering spare parts from a Yamaha dealer or for reference in case the ATV is - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 142
1. Vehicle identification number (front left side) 1. Model label EBU29662 TIP The vehicle identification number is used to identify your ATV. EBU26050 11 Model label The model label is affixed at the location in the illustration. Record the information on this label in the space provided. This - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 143
1 1. Vehicle Emission Control Information label 11 11-3 - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 144
EBU26060 Noise regulation TAMPERING WITH NOISE CONTROL SYSTEM PROHIBITED: Federal law prohibits the following acts or the causing thereof: (1) The removal or rendering inoperative by any person other than for purposes of maintenance, repair, or replacement of any device or element of design - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 145
) 15000 (9600) 17500 (11200) 20000 (12800) 22500 (14400) 25000 (16000) hours 20 80 160 320 480 640 800 960 1120 1280 1440 1600 DATE OF SERVICE MILEAGE SERVICING DEALER NAME AND ADDRESS REMARKS 11 11-5 - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 146
to: 1. Operate and maintain the ATV as specified in the appropriate owner's manual; 2. Give notice to an authorized Yamaha ATV dealer of any and all An inspection and registration fee will be charged for this service. EMISSION CONTROL SYSTEM WARRANTY Yamaha Motor Corporation, USA also warrants - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 147
specified in the Owner's and Service Manual. We do recommend, however, service, you must take it to any authorized Yamaha ATV dealer within the continental United States. Be sure to bring your warranty registration card or other valid proof of the original date of purchase. If a question or problem - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 148
no extra cost. TRIP gives you up to $150 reimbursement per occurrence for any reasonable expenses you incur because your Yamaha needs covered service: replacement vehicle rental, emergency towing, phone calls, even food and lodging when you are away from home. This superb coverage goes into effect - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 149
, contact Yamaha with your Primar y ID number (your frame number). We ' ll be happy to help you get the Y.E.S. coverage you need. Yamaha Service Marketing P.O. Box 6555 Cypress, CA 90630 11 WARNING Indicates a hazardous situation which, if not avoided, could result in death or serious injury. 11-9 - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 150
EBU26132 11 11-10 - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 151
INDEX A Accessories and loading ...6-7 Accessories, auxiliary jack ...4-22 Air filter element, cleaning ...8-20 Axle boots ...8-34 D Differential gear oil ...5-3, 8-18 Drive shaft universal joint, lubricating ...8-39 E Engine break-in ...6-5 Engine, cold start ...6-1 Engine idling speed ...8-25 - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 152
-wheel-drive switch ...4-7 Override switch ...4-6 Owner's manual and tool kit ...8-1 T Tail/brake light bulb, replacing ...8-48 Throttle cable free play, adjusting ...8-26 Throttle lever ...4-10, 5-4 Tires ...5-4 Troubleshooting ...8-51 Troubleshooting chart ...8-52 P Parking ...6-6 Parking brake - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 153
Warranty, limited ...11-6 Wheel hub bearings, checking ...8-39 Wheel, installing ...8-50 Wheel, removing ...8-49 - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 154
- 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 155
- 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 156
and control. with a passenger-passengers affect balance and steering and increase risk of losing control. LOCATE AND READ OWNER'S MANUAL. FOLLOW ALL INSTRUCTIONS AND WARNINGS. (For replacement manual, call 1-800-532-1558) NEVER operate: YAMAHA MOTOR CO., LTD. PRINTED IN USA 2009.05-0.3×1 CR (E) - 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 157
- 2010 Yamaha Motorsports Big Bear 400 4x4 IRS | Owners Manual - Page 158
This ATV should not be ridden by anyone under 16 years of age.
WARNING
OWNER’S MANUAL
4S1-F8199-13
LIT-11626-23-28
YFM40FBZ
YFM40FBHZ
READ THIS MANUAL CAREFULLY!
It contains important safety information.