3 - 8
CHK
ADJ
c. Measure the valve clearance using a thick-
ness gauge
.
Out of specification → Adjust.
3. Adjust:
• valve clearance
a. Loosen the locknut
.
b. Insert a thickness gauge
between the
adjuster end and the valve end.
c. Turn the adjuster
clockwise or counter-
clockwise with the tappet adjusting tool
until the proper clearance is obtained.
d. Hold the adjuster to prevent it from moving
and then tighten the locknut.
e. Measure the valve clearance.
f. If the clearance is incorrect, repeat the
above steps until the proper clearance is
obtained.
T
R
.
.
Locknut
9 Nm (0.9 m · kg, 6.5 ft · lb)
4. Install:
• C.D.I. magneto cover
• Cylinder head cover
Refer to “CYLINDER HEAD” in chapter 4.
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1
1
2
3
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2
3
4
4
ADJUSTING THE ENGINE IDLING SPEED
1. Start the engine and let it warm up for sev-
eral minutes.
2. Attach:
• engine tachometer
(to the spark plug lead)
3. Measure:
• engine idling speed
Engine idling speed
1,600 ~ 1,800 r/min
Out of specification → Adjust.
1
ADJUSTING THE VALVE CLEARANCE/
ADJUSTING THE ENGINE IDLING SPEED
1