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b
1
2
1
3
2
IDLE SPEED ADJUSTMENT/
VALVE CLEARANCE ADJUSTMENT
a
4
1
3 - 10
IDLE SPEED ADJUSTMENT
1. Start the engine and thoroughly warm it up.
2. Attach:
• Tachometer
To spark plug lead.
3. Adjust:
• Idle speed
Adjustment steps:
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.
Engine idling speed:
1,600 ~ 1,800 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:
• Spark plug cap 1
• Spark plug
• Tappet cover (intake side) 2
• Tappet cover (exhaust side) 3
• Camshaft sprocket cover 4
2. Remove:
• Timing plug 1
• Crankshaft end cover 2
• O-rings
INSP
ADJ
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