2-6
CHECK AND ADJUST
IGNITION TIMING
The ignition system of this vehicle is
controlled by C.D.I unit, thus don‘t need
to adjust anything. If the ignition timing
isn’t correct then checking the ignition
system whether normally.
•
Removing the L side cover.
•
Removing the rubber bung.
•
Using the timing light to check the
ignition timing. The mark of
crankcase aim at the “F” mark of
flywheel, when the engine speed
running at idle.
IGNITION PERIOD
•
Using the timing light to check the
ignition
period.
•
Keep the engine speed about
5000rpm, if the flywheel mark aim at
the enter angle mark of crankcase
then the ignition period is correct.
CYLINDER PRESSURE
•
Remove the spark plug.
•
Install the pressure gauge.
•
Open the throttle and press the
electric start button.
The normal cylinder pressure is about
128kg/cm
2.
(570 rpm)
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.
Timing light
