2011 Yamaha Motorsports Big Bear 400 4x4 IRS Owners Manual - Page 106
2011 Yamaha Motorsports Big Bear 400 4x4 IRS Manual
Page 106 highlights
ECB00480 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 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). 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 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. 1. Throttle stop screw Engine idling speed: 1450-1550 r/min 8-26
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