Periodic maintenance and adjustment7-127EAU21363Adjusting the engine idlingspeedThe engine idling speed must bechecked and, if necessary, adjusted asfollows at the intervals specified in theperiodic maintenance and lubricationchart.TIPA diagnostic tachometer is needed tomake this adjustment.1. Attach the tachometer to thespark plug lead.2. Start the engine and warm it up forseveral minutes at 1000–2000r/min while occasionally revving itto 4000–5000 r/min.TIPThe engine is warm when it quickly re-sponds to the throttle.3. Check the engine idling speedand, if necessary, adjust it tospecification by turning the throt-tle stop screw. To increase the en-gine idling speed, turn the screw indirection (a). To decrease the en-gine idling speed, turn the screw indirection (b).TIPIf the specified idling speed cannot beobtained as described above, have aYamaha dealer make the adjustment.1. Throttle stop screw(a)(b)1Engine idling speed:1600–1800 r/min
