2009 Yamaha Motorsports Big Bear 250 Owners Manual - Page 112
2009 Yamaha Motorsports Big Bear 250 Manual
Page 112 highlights
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). TIP If the specified idling speed cannot be obtained as described above, have a Yamaha dealer make the adjustment. EBU24044 Adjusting the throttle cable free play The throttle cable free play should be checked and, if necessary, adjusted at the intervals specified in the periodic maintenance and lubrication chart. The throttle cable free play should measure 3.0- 5.0 mm (0.12-0.20 in) at the throttle lever. Periodically check the throttle cable free play and, if necessary, adjust it as follows. TIP The engine idling speed must be checked, and adjusted if necessary, before adjusting the throttle cable free play. 1. Loosen the locknut. 2. To increase the throttle cable free play, turn the throttle cable free play adjusting bolt in direction (a). To decrease the throttle cable free play, turn the adjusting bolt in direction (b). 8-25 8 1. Throttle stop screw Engine idling speed: 1400-1500 r/min