Compression Check: Testing and Inspection
INSPECT COMPRESSIONa) Warm up and stop the engine.
b) Remove the ignition coil.
c) Remove the spark plugs.
d) Inspect the cylinder compression pressure.
SST 09992-00500
1) Insert a compression gauge into the spark plug hole.
2) Fully open the throttle.
3) While cranking the engine, measure the compression pressure.
Compression pressure: 1,400 kPa (14.3 kgf/cm2, 203 psi)
Minimum pressure: 1,000 kPa (10.3 kgf/cm2, 145 psi)
Difference between each cylinder: 110 kPa (1.1 kgf/cm2, 16 psi)
NOTICE:
^ Use a fully-charged battery so the engine speed can be increased to 250 rpm or more.
^ Inspect the other cylinders in the same way.
^ Measure the compression in as short a time as possible.
4) If the cylinder pressure in one or more cylinders is low, pour a small amount of engine oil into the cylinder through the spark plug hole and repeat steps (1) through
3) for cylinders with low pressure.
^ If adding oil increases the compression, the piston rings and/or cylinder bore may be worn or damaged.
^ If the pressure stays low, the valve may be stuck or seated improperly, or there may be leakage from the gasket.