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d．Recheck valve clearance after tightening the valve lock nut——torque value: 8±1N.m.
e．Set the new gasket aligning the projection of the new gaskets with the projection of the cylinder head.
f．Install the valve cover and tighten the four bolts to the specified torque——bolt torque value: 10±2N.m.
Valve bolt—screw in: valve clearance becomes smaller
Valve bolt— screw out: valve clearance becomes bigger
CAUTION:
Clearance too big: Intake and exhaust valve opening delay will shorten the intake and exhaust time, lower the opening
height of the valve and change normal distributing phase to result in power lowering from the intake lack and exhaust
incomplete. Furthermore, it will also make valve train parts knock increasingly and wear quickly.
Clearance too small: After running, engine parts will be heated to expand and push the valve open, making the engine
closing not tight and result in leaking, power lowering, serious carbon deposit or burn on the valve surface, even valve
impacting the piston.
3-7 Governor adjusting
● Governor adjusting：
(1) Dismount the air cleaner.
(2) Loosen the nut M6. Be sure that the carburetor throttle valve is fully open.
(3) Rotate the governor arm shaft fully to the right (governor fully open position) to bottom by pressing governor support,
and retighten the nut— torque value: 7±1N.m.
(4) Check to see that the governor support and throttle valve move freely.
(5) Check the maximum engine speed.
Valve bolt
Lock nut
Rocker shaft
Rocker
Rocker
Governor support
Throttle valve
Governor arm
Nut M6
Throttle control assy.
Governor spring
Choke lever
Stop switch
Fuel switch