Cylinder Compression Pressure; Driving System; Driving Belt; Clutch Pad - Sym Symply50 Service Manual

SYM
CYLINDER COPMRESSION PRESSURE
Warn up engine and then turnoff the engine.
Remove the luggage box and the center
cover.
Remove spark plug cap and spark plug.
Install compression gauge.
Full open the throttle valve, and rotate the
engine by means of stepping the
kick-starting lever.
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: 11.8±0.4:1 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 SYSTEM

DRIVING BELT

Remove left side cover.
Remove mounting bolt located under air
cleaner.
Remove 9 bolts of the engine left crankcase.
Remove the left crankcase 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.
Width limit: above 18.5 mm

Clutch pad

Start the motorcycle and gradually increase
throttle valve openness to check clutch pad
operation.
If the motorcycle moves with shaking, then
check its clutch pad for wearing. Replace it
if necessary.
2. MAINTENANCE INFORMATION
Spark plug
Gear teeth
Clutch pad
Cylinder
pressure
gauge
Width
Clutch
2-9