Crankcase Cover - Honda GX 120 Tech Manual

CRANKCASE COVER

Remove crankcase cover.
A. Cover must be "as cast" and in factory machined condition and there must be no addition or subtraction of metal or
any other substance to crankcase cover.
B. Crankcase cover gasket must be stock Honda. Only one gasket may be installed with a maximum thickness of
0.025".
C.
Critical dimensions are - thrust face of camshaft holder and position of crank bearing. Place a straight edge over
crank bearing and cam boss thrust face. These surfaces should be level. Maximum tolerance will be + 0.005".
There will be no alterations to crankcase cover. This includes any alteration to crank bearing and camshaft holder
position and height in an attempt to alter valve timing.
PISTON - WRIST PIN AND PISTON RINGS
Remove rod and piston – triangle or boss on top of piston must point toward push rods - piston, wrist pin and rings must be
absolutely stock and not altered in any manner.
TIER III- Round Boss
PISTON NOTES
Piston will be stock Honda standard size and will not be altered in any way.
A. Oversized pistons must not be used.
B. All three piston rings must be used and installed properly.
1. Top ring: Chrome compression ring installed with "N" or "T" on rail up. Thai rings are marked R. No expander
under ring.
OLD STYLE- Triangle
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