EBU02960Carburetor adjustmentThe carburetor is a vital part of the engine andrequires very sophisticated adjustment. Mostadjusting should be left to a Yamaha dealerwho has the professional knowledge and ex-perience to do so. However, the idling speedmay be performed by the owner as a part ofthe usual maintenance routine.CAUTION:_The carburetor was set at the Yamaha fac-tory after many tests. If the settings aredisturbed by someone without sufficienttechnical knowledge, poor engine perfor-mance and damage may result._EBU12580Idle speed adjustmentNOTE:_A diagnostic tachometer must be used for thisprocedure._1. Start the engine and warm it up for a fewminutes at approximately 1,000 to2,000 r/min. Occasionally rev the engineto 4,000 to 5,000 r/min. The engine iswarm when it quickly responds to thethrottle.2. Remove the seats. (See page 4-16 forseat removal and installation procedures.)3. Remove the console. (See page 8-8 forconsole removal and installation proce-dures.)4. Connect the tachometer to the spark pluglead, and then set the idle to the specifiedidling speed by adjusting the throttle stopscrew. Turn the screw in direction a toU5UG10.book Page 29 Friday, August 1, 2003 7:40 PM
