Piston/Piston Ring Removal; Piston/Piston Ring Inspection - Honda Motorcycle Service Manual

PISTON/PISTBN WING
REMOVAL
NOTE
Place a clean shop towel over the crankcase to prevent
the possibility of the clip falling into the crankcase.
Remove the piston pin clip using a pair of pliers.
Press the piston pin out of the piston.
2-stroke engines:
Remove the needle bearing from the small end of the connect-
ing rod
Do not apply side force to the connecting rod.
Do not let the clip fall into the crankcase.
.
Mark and store the pistons and piston pins so that they
INSPECTION
Clean carbon deposits from the piston.
I
\ PISTON
1
PISTON PIN CLIP PISTON PIN
NOTE
u
a rina that will be discarded. Never use the wire brush; it
will scratch the groove.
I
Inspect the piston rings for movement by pressing the rings.
The rings should be able to move in its groove without
/ - - -
I .
catching.
Spread each piston ring and remove it by lifting it up at a point
just opposite the gap.
CAUTION
Do not damage the piston ring by spreading the ends too
1
far.
Some 2-stroke engines: Remove the expander from the se-
1
cond ring groove.
Inspect the piston:
.
Sliding surface for scratches or wear.
Remove any small surface scratches using #600-#800
sandpaper. If there are deep scratches, replace the piston.
.
Piston ring grooves-for excessive wear. Replace the
piston as necessary.
4-stroke engines: Oil pass holes in the oil ring groove-for
clogs. Clean the oil holes with compressed air.
PISTON RING
L I E N
I
iian
WEAR
10-6
Date of Issue: Nov..
1989
0
HONDA MOTOR CO., LTD.