Sym Symply50 User Manual

SYM 2. MAINTENANCE INFORMATION
2-9
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
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.
Rotate the engine until the reading in the
gauge no more increasing.
Usually, the highest pressure reading will be
obtained in 4~7 seconds.
Gear teeth
Width
Cylinder
pressure
gauge
Clutch
Clutch pad
Spark plug

Sym Symply50 Specifications

General

Brand	Sym
Model	Symply50
Category	Scooter
Language	English