5-32 ENGINE TOP END
Cylinder Compression Measurement
Be sure the battery is fully charged.
Warm up the engine thoroughly.
Stop the engine.
Remove one spark plug and attach the compression
gauge and adapter firmly into the spark plug hole. Do not
remove the other spark plug, only the plug lead.
For the other cylinder, remove both spark plugs.
Special Tool - Spark Plug Wrench, Hex 18: 57001-1024 [A]
Using the starter motor, turn the engine over with the throt-
tle fully open until the compression gauge stops rising; the
compression is the highest reading obtainable.
Special Tools - Compression Gauge: 57001-221 [A]
Compression Gauge Adapter, M12 × 1.25:
57001-1018 [B] (or 57001–1183)
Cylinder Compression (Usable Range)
340 ~ 590 kPa (3.5 ~ 6.0 kgf/cm², 50 ~ 85 psi)
@300 r/min (rpm)
The compression gauge adapter: 57001-1183 can also
Repeat the measurement for the other cylinder.
Install the spark plugs.
Torque - Spark Plugs: 18 N·m (1.8 kgf·m, 13 ft·lb)