G120F/G160F/G200F Part III Maintenance
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3-8 Carburetor (idle speed)
1) Start the engine and allow it to warm up for about
10 minutes.
2) Set the throttle lever in the position for lowest
speed.
3) Use tools to adjust the throttle stop screw, to
bring the idle speed within the range of standard
idle speed.
Standard idle speed: 1400±150rpm。
3-9 Valve clearance
Valve clearance inspection and adjustment must be
performed with the engine cold.
1) Remove the cylinder head cover bolt, cylinder
head cover and gasket.
2) Set the piston at top dead center (both valves fully
closed). The position of the flywheel’s magnet
corresponding to the front face of the ignitor is
the timing point.
3) Insert a feeler gauge between the rocker arm
and valve to measure valve clearance.
4) If adjustment is necessary, proceed as follows:
a. Hold the rocker arm pivot with a wrench and loosen
the pivot lock nut.
b. Loosen the rocker arm pivot and turn the rocker
arm pivot to obtain the specified valve clearance.
c. Hold the rocker pivot with a wrench and tighten the
lock nut.
d. Recheck the valve clearance after tightening the lock nut.
IN 0.15±0.02mm
Valve
clearance
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