10-21
HRN216 CAMSHAFT/CRANKSHAFT/ PISTON/CYLINDER
Apply engine oil to the piston pin bore and the connecting rod small
end.
Apply engine oil to the piston pin and install it in the piston.
Install the new piston pin clips.
Install the piston/connecting rod into the cylinder (P. 10-8
).
During installation, be sure to position the piston so that the "FW
" stamped at the front of the piston points up toward the
flywheel.
9. CYLINDER COMPRESSION CHECK
Start the engine and warm up to normal operating temperature.
Turn the fuel valve lever to the OFF position. Remove the fuel from
the carburetor bowl by running the engine until the engine stops
from lack of fuel, or by manually draining the fuel from the
carburetor bowl if the engine will not run.
Remove the spark plug cap from the spark plug.
Remove the spark plug using a spark plug wrench.
Pull the recoil starter several times to expel unburned gasoline.
Thread a commercially available compression gauge into the spark
plug hole.
PKA/VKA/VLA types:
Have an assistant pull and hold the flywheel brake lever against
the handlebar, or use a strap to hold the flywheel brake lever
against the handlebar.
Briskly and repeatedly pull the recoil starter 4 or 5 times to
measure stable cylinder compression.
Due to variations in cranking rpm, manufacturing tolerances,
engine wear, and/or carbon buildup over time, the cylinder
compression reading may be lower or higher than the indicated
specification. A compression reading that measures slightly
outside of the indicated specification does not mean there is an
immediate problem that requires repair.
CYLINDER COMPRESSION:
0.50 MPa (5.1 kgf/cm
2
, 73 psi) / 600 rpm
PISTON PIN
CLIPS (2)
PISTON
PIN
FLYWHEEL
MARK
CONNECTING ROD
The connecting rod
can be installed in
either direction
during reassembly.
COMPRESSION GAUGE
EEPV503 (commercially available)
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