ENGINE
60
CS-2511WES
251Ws
8-7 Inspectingpistonandpistonring
{Disassembling}
1. Inspect piston ring (A) and replace it if broken,
scored, or exceeded service limits (Refer to 1-5
Servicelimits).
2. Inspect piston crown (B). Clean with ne sand
paper, oil stone, and soft cleaning brush (C) if car-
bon is found.
3. Inspect top land (D), ring groove and skirt (E).
Clean them with soft cleaning brush (C), if carbon
is found.
NOTE: Do not use square end of broken piston
ring when cleaning piston ring groove, otherwise
piston ring groove might be damaged.
4. Remove snap rings (F) from both sides of piston
pin.
5. Push piston pin (G) out from piston (H).
NOTE: If piston pin is tight, use piston pin tool
897702-30131 (J) with adapter (K) stamped “8” on
an end.
6. Inspect piston pin, needle bearing and piston
pin spacers, and replace if wear or discoloration is
noted.
{Assembling}
7. Lubricate needle bearing (L) with 2-stroke oil.
8. Set needle bearing (L) and piston pin spacers (M)
on small end of connecting rod (N).
9. Place piston (H) over connecting rod (N).
B
A
D
E
C
F
J
K
G
H
M
L
N
M
H
N
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