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MAINTENANCE
CHECKING/ADJUSTING THE VALVE
CLEARANCE
See Figures 26 - 27.
NOTICE
Checking and adjusting valve clear-
ance must be done when the engine is cold.
l Turn the generator off and allow the engine to cool for
30 minutes.
l Place the generator on a level surface in a well-ventilated
area.
l Remove the rocker arm cover and carefully remove the
gasket. If the gasket is torn or damaged, it must be re-
placed.
l Remove the spark plug so the engine can be rotated more
easily.
l Pull the recoil handle to rotate the engine to top dead
center (TDC). Looking through the spark plug hole; the
piston should be at the top (both valves are closed).
l Both rocker arms should be loose at TDC on the com-
pression stroke. If they are not, rotate the engine 360°.
l Insert a feeler gauge between the rocker arm and the
valve stem to measure valve clearance.
Intake Valve
Valve
0.0031 – 0.0047 in
Clearance
(0.08 – 0.12 mm)
8 –12 Nm
Torque
l If an adjustment is necessary, loosen the jam nut.
l Slide the appropriate feeler gauge between the rocker
arm and the valve stem.
l Tighten the adjustment screw onto the push rod to obtain
the specified clearance.
NOTE: You should be able to feel the rocker arm touch
the feeler gauge.
FIG. 26
A - Rocker arm cover
B - Bolt
C - Gasket
FIG. 27
A - Adjustment screw
Exhaust Valve
B - Jam nut
C - Feeler gauge
0.005 – 0.007 in
D - Rocker arm
(0.13 – 0.17 mm)
E - Valve stem
8 –12 Nm
F - Push rod
l Hold the adjustment screw in place and tighten the nut.
l Recheck valve clearance.
l If no further adjustments are needed, perform this proce-
l When finished, install the gasket, rocker arm cover, and
B
C
D
E
Torque: 106 inch-pound (12 Nm)
dure on the other valve.
spark plug.
A
A
B
C
F
English | 27
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