U5PA88E0.book Page 14 Tuesday, June 9, 2009 8:44 AM
PERIODIC MAINTENANCE AND ADJUSTMENT EAU42110
Adjusting the carburetor 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 serviced by the owner as part of routine maintenance. ECA10550
NOTICE
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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.
EAU44390
Adjusting the engine idling speed The engine idling speed must be adjusted when necessary. 1. Start the engine and thoroughly warm it up. 2. Turn the throttle stop screw until the engine runs at the lowest possible speed. 3. To increase the engine idling speed, turn the throttle stop screw in direction (a). To decrease the engine idling speed, turn the throttle stop screw in direction (b).
EAU21370
Adjusting the throttle cable free play
1. Throttle cable free play
The throttle cable free play should measure 3.0–5.0 mm (0.12–0.20 in) at the throttle grip. Periodically check the throttle cable free play and, if necessary, adjust it as follows. TIP The engine idling speed must be correctly adjusted before checking and adjusting the throttle cable free play.
1. Throttle stop screw
7-14
1. Loosen the locknut.
