2009 Yamaha Motorsports RS Venture Owners Manual - Page 54

Periodic maintenance and adjustment When the engine has cooled, place a thick rag or towel over the coolant reservoir cap, and slowly rotate the cap counterclockwise to the detent. This procedure allows any residual pressure to escape. When the hissing sound has stopped, press down on the cap while turning counterclockwise and remove it. To check the coolant level 1. Place the snowmobile on a level surface and apply the parking brake. 2. Open the shroud. 3. Check the coolant level in the coolant reservoir when the engine is cold. If the coolant level is below the "COLD LEVEL" mark, add soft water until it reaches the "COLD LEVEL" mark. (See the following section "Replenishing the coolant" for more details.) NOTICE: Hard water or salt water is harmful to the engine parts. You may use boiled or distilled water, if soft water is not available. Tap water can be used temporarily in an emergency. [ECS00491] ECS00500 NOTICE Operating the engine with an improperly bled cooling system can cause overheating and severe engine damage. Replenishing the coolant 1. Remove the coolant reservoir cap and add coolant until it reaches the "COLD LEVEL" mark. 1. "COLD LEVEL" mark 2. Coolant reservoir cap 1. "COLD LEVEL" mark Bleeding the cooling system The cooling system must be bled of air if the coolant reservoir becomes empty, if air can be seen in the cooling system, or if there is a cooling system leak. Consult a Yamaha dealer. 2. Recommended antifreeze: High-quality ethylene glycol antifreeze containing corrosion inhibitors Antifreeze and water mixing ratio: 3:2 Total amount: 5.40 L (5.71 US qt, 4.75 Imp.qt) Start the engine and add coolant until the coolant level does not go down, and then stop the engine. Fill the coolant reservoir with coolant until it reaches the "COLD LEVEL" mark. 3. 48