ENGINE (YP125R)
3-6
EAS37P1087
ENGINE (YP125R)
EAS37P1088
ADJUSTING THE VALVE CLEARANCE
The following procedure applies to all of the
valves.
IP
• Valve clearance adjustment should be made
on a cold engine, at room temperature.
• When the valve clearance is to be measured or
adjusted, the piston must be at top dead center
(TDC) on the compression stroke.
1. Remove:
• Storage box
Refer to “GENERAL CHASSIS” on page 4-1.
2. Remove:
• V-belt case cover “1”
• V-belt case air duct “2”
• V-belt case air filter element
3. Remove:
• Spark plug cap
• Spark plug “1”
• Cylinder head cover “2”
4. Remove:
• Timing mark accessing plug “1”
5. Measure:
• Valve clearance
Out of specification → Adjust.
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a. Turn the primary sheave nut on the left side
of the crankshaft counterclockwise to turn the
crankshaft.
b. Align the “I” mark “a” on the generator rotor
with the stationary pointer “b” on the genera-
tor cover.
1
2
Valve clearance (cold)
Intake
0.10–0.14 mm (0.0039–0.0055 in)
Exhaust
0.22–0.26 mm (0.0087–0.0102 in)
1
2
1
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