CHECK AND ADJUST
IGNITION TIMING
Using the timing light to check the ignition
timing.
Keep the engine speed about 4000 rpm, if 2
mark-lines on flywheel aim at center of
inspection hole then the ignition timing is
correct.
CYLINDER PRESSURE
Remove the spark plug cap and spark plug.
Install the pressure gauge.
Rotate the throttle and press the electric
start button.
The normal cylinder pressure is 12~14
kg/cm2.
If the cylinder pressure is too low then check
the following items
：
- Valve leakage?
- Valve gap is too tie?
- Cylinder head gasket is damage?
- Piston ring wear-out?
- Piston, cylinder wear-out?
If the cylinder pressure is too high then
check the combustion chamber and the top
face of piston whether with too much carbon
residue.
