Piston Installation - Honda Motorcycle Service Manual

2-stroke Engines:
Clean the piston ring grooves.
Lubricate the piston rings and ring grooves with clean 2-stroke
oil.
Install the piston rings on the piston with the marks facing up.
NOTE
Do not confuse the top and second rings. Be sure to in-
stall them in the proper grooves.
-
Some 2-stroke engines use an expander ring behind the
second ring.
2-STROKE ENGINE
In 2-stroke engines, the piston has locating pins that hold the
2-STROKE ENGINE
LOCATING PINS
piston rings away from the intake and exhaust ports.
Align the piston ring end gaps with the locating pins.
I
Check the fit of each ring in its groove by pressing the ring into
the groove. Make sure that it is flush with the piston at several
points around the ring.
if the ring rides on the locating pin, it is damaged during
assembly.
PISTON INSTALLATION
Coat the needle bearing @stroke engine only1 and piston pin
with the recommended oil.
Lubricate the piston pin.
4-STROKE ENG
/--73
!!??ON
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4-STROKE ENGINE: Molybdenum solution
2-STROKE ENGINE: Recommended engine oil
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/
.
Place a clean shoo towel over the crankcase to orevent
/
1 1
NOTE
/
1 - a
/
the clip from fallinn into the crankcase.
1
install the needle bearing into the connecting rod.
install the piston and insert the piston pin.
NOTE
/
.
The mark that is stamped on the piston head should be
/
facing the correct direction.
"IN" MARK: TO INTAKE SlDE
"EX" or "A" MARK: TO EXHAUST SlDE
Install new piston pin clips
CAUTION
.
Always use new piston pin clips. Reinstalling used piston
in
c l i ~ s mav lead to serious engine damaae.
NOTE
Take care not t o drop the piston pin clip into the
crankcase.
Set the piston pin clip in the groove properly.
Do not align the clip's end gap with the piston cutout.
NEEDLE
BEARING
I
PISTON PIN MARK
Date of Issue: Sep., 1988
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HONDA MOTOR CO., LTD