5-20 ENGINE TOP END
Cylinder Compression Measurement
Start the engine.
Thoroughly warm up the engine so that the engine oil be-
tween the piston and cylinder wall will help seal compres-
sion as it does during normal running.
Stop the engine.
Fuel Tank (see Fuel Tank Removal in the Fuel System
Remove the spark plug [A] with spark plug wrench [B].
Special Tool - Spark Plug Wrench, Hex 16: 57001-1262
Attach the compression gauge [A] and the adapter hose
[B] firmly into the spark plug hole.
With the throttle fully open, turn the engine over sharply
with the kickstarter several times until the compression
gauge stops rising; the compression is the highest read-
Special Tools - Compression Gauge, 20 kgf/cm²: 57001-221
Compression Gauge Adapter, M10 × 1.0:
Service Range: 420 ∼ 700 kPa (4.28 ∼ 7.14 kg/cm², 60.9
∼ 102 psi) @ 5 kicks
Install the spark plug.
Torque - Spark Plug: 13 N·m (1.3 kgf·m, 115 in·lb)
Pull the spark plug cap lightly to make sure the installation
of the spark plug cap.