Part III Maintenance
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spark plug mounting thread disorder inside the engine.
6. Install the spark plug cap onto the spark plug.
3-6 Adjustment of valve clearance
The check and adjustment of valve clearance must be
conducted when the engine is cold.
Seen from the output end of the engine, firstly adjust
the valve clearance of the left cylinder, then rotate
anticlockwise the crankshaft to 270° before adjusting
the right cylinder.
1. Remove the cylinder-head cover and place the piston
on the upper dead center of compression stroke,
The two valves are both closed.
2. Measure the clearance between the rocker arm and
valve stem with a thickness gauge.
Inlet valve: 0.10 ~ 0.15 mm
Exhaust valve: 0.15 ~ 0.20 mm
3. To adjust the valve, the valve-adjusting nut shall be
fixed and loosen the valve while fastening the nut.
4. Rotate the valve-adjusting nut to obtain the specified clearance.
5. Re-check the valve clearance and re-adjust it if necessary.
6. Install the cylinder-head cover.
3-7 Adjustment of idle speed
Mechanical speed regulating engine
1. Start the engine outdoors to warm it for a while.
2. Place the control level to the minimum rotation speed
location.
3. Adjust the idle adjusting screw with tools to control the
rotation speed within the scope of standard idle speed.
Electronic adjustable speed engine
1. Start the engine outdoors to warm it for a while.
2. Connect idle switch
Valve adjusting nut
Thickness gauge
Valve rocker arms
Low speed
High speed
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