Cylinder Compression - Honda V30 Magna VF500C Manual

CYLINDER HEAD/VALVE
Check the cylinder head cover gasket for damage or
deterioration.
NOTE:
Clean the gasket before applying sealant.
Apply sealant to the cylinder head cover gasket.
Install the cylinder head cover.
TORQUE: 8-12 N·m (0.8-1.2 kg-m, 6-9 ft-Ib)
I nstall the removed part in the reverse order of
removal.
CYLINDER COMPRESSION
Warm up the engine.
Stop the engine, then disconnect the spark plug
caps and remove the spark plugs.
I nsert the compression gauge.
Open the throttle all the way and crank the engine
with the starter motor.
NOTE:
Crank the engine until the gauge reading stops
rising. The maximum reading is usually
reached within 4-7 seconds.
COMPRESSION PRESSURE:
1,200 ± 200 kPa
(12.0
±
2.0 kg/cm
2
,
170
±
28 psi)
If compression is low, check for the following:
Improper valve clearance
- leaky valves
- leaking cylinder head gasket
- Worn piston/ring/cylinder
If compression is high, it indicates that carbon
deposits have accumulated on the combustion
chamber and/or the piston crown.
9-24
COMPRESSION GAUGE
~HONDA
~ V30 MAGNA
Date of Issue: July, 1984
© HONDA MOTOR CO., lTD.