Cylinder Compression Test - Sym Wolf SB 250 Ni Service Manual

2. Maintenance Information
Replace oil filter
Remove bolts of oil filter chamber.
Remove the filter and replace it with a new one.
Caution
Oil filter is paper type and cannot be cleaned

or reused.

Cylinder compression test

Warm up engine and turn it off.
Remove left cylinder head cover
Remove spark plug cap and spark plug.
Install compression gauge into the spark plug hole,
full open the throttle, and rotate the engine.
Caution
Rotate the engine until the reading in the gauge
gains no more.
Usually, the highest-pressure reading will

appear in 4~7 seconds.
Compression pressure：12 ±2 Kgf/cm²
Check the following items if the pressure is too
low:
Incorrect valve clearance.

Valve leakage

Cylinder head leakage. Piston, piston ring,

cylinder damaged.
Over-high pressure means combustion chamber
o r piston top deposit carbon.
2-4
boltx2
Oil filter
Spark plug
Pressure
gauge