2010 Yamaha Motorsports Grizzly 125 Automatic Owners Manual - Page 90

EBU23940 Adjusting the carburetor 1 2 3 4 5 6 7 8 9 10 11 The carburetor should be checked and, if necessary, adjusted at the intervals specified in the periodic maintenance and lubrication chart. The carburetor is an important part of the engine and requires very sophisticated adjustment. Therefore, most carburetor adjustments should be left to a Yamaha dealer, who has the necessary professional knowledge and experience. The adjustment described in the following section, however, may be performed by the owner as part of routine maintenance. ECB00480 TIP A diagnostic tachometer is needed to make this adjustment. 1. Start the engine and warm it up. TIP The engine is warm when it quickly responds to the throttle. 2. Attach the tachometer to the spark plug lead. 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). NOTICE The carburetor has been set and extensively tested at the Yamaha factory. Changing these settings without sufficient technical knowledge may result in poor performance of or damage to the engine. EBU24000 Adjusting the engine idling speed The engine idling speed must be checked and, if necessary, adjusted as follows at the intervals specified in the periodic maintenance and lubrication chart. 8-24