ENGINE
CS-501SX, CS-501SXH
501sx
52
8-6 Inspecting piston and piston ring
1. Inspect piston ring and replace it if broken or
scored, or if it exceeds service limits (Refer to “1-
5”).
2. Inspect piston crown. Clean with fi ne sand pa-
per, oil stone, or soft cleaning brush (A) if carbon is
found.
3. Inspect top land, ring groove and skirt. Clean
them with soft cleaning brush (A) 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 ring (B) from both sides of piston
pin, using small fl at head screwdriver (C).
NOTE:
Piston holder 897719-02830 (D) is recom-
mended.
5. Push piston pin out from piston.
NOTE:
If piston pin is tight, use Piston pin tool
897702-30131 (E) with adapter (F) stamped “11”
on an end.
6. Inspect needle bearing and washers, and re-
place if wear or discoloration is noted.
A
B
D
C
E
F
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