Cylinder Compression Pressure; Driving Belt - Sym Joyride125 Service Manual

CYLINDER COPMRESSION
PRESSURE
Warm up engine.
Turn off the engine.
Remove the trunk.
Remove the central cover.
Remove spark plug cap and spark plug.
Install compression gauge.
Full open the throttle valve, and rotate the
engine by means of starter motor.
Caution
Rotate the engine until the reading in the
gauge no more increasing.
Usually, the highest pressure reading will be
obtained in 4~7 seconds.
Compression pressure: 12 ± 2 Kg/cm²
Check following items if the pressure is too low:
˙Incorrect valve clearance.
˙Valve leaking.
˙Cylinder head leaking, piston, piston ring and
cylinder worn out.
If the pressure is too high, it means carbon
deposits in combustion chamber or piston
head.

DRIVING BELT

Remove left side cover.
Remove mounting bolt located under air cleaner.
Remove 9 bolts of the engine left side cover and
the cover.
Check if the belt is crack or worn out.
Replace the belt if necessary or in accord with
the periodical maintenance schedule to replace
it.
2. MAINTENANCE INFORMATION
To this chapter contents
Teeth
Width
2-7