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IDLE SPEED ADJUSTMENT/
VALVE CLEARANCE ADJUSTMENT
3 - 9
IDLE SPEED ADJUSTMENT
1. Start the engine and thoroughly warm it up.
2. Attach:
• Inductive tachometer
To spark plug lead.
3. Adjust:
• Idle speed
Adjustment steps:
• Adjust the pilot screw.
Refer to "PILOT AIR SCREW ADJUST-
MENT" section.
• Turn the throttle stop screw 1 until the
engine runs at the lowest possible speed.
To increase idle speed → Turn the throt-
tle stop screw 1 in a.
To decrease idle speed → Turn the throt-
tle stop screw 1 out b.
Inductive tachometer:
YU-8036-B/90890-03113
Engine idling speed:
1,400 ~ 1,600 r/min
VALVE CLEARANCE ADJUSTMENT
NOTE:
• The valve clearance should be adjusted
when the engine is cool to the touch.
• The piston must be at Top Dead Center
(T.D.C.) on compression stroke to check or
adjust the valve clearance.
1. Remove:
• Air scoop (right) 1
• Air filter case 2
2. Remove:
• Spark plug
• Tappet cover (intake side) 1
• Tappet cover (exhaust side) 2
3. Remove:
• Timing plug 1
• Crankshaft end cover 2
• O-rings
INSP
ADJ
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