47
ENGINE
CS-370ES
CS-420ES
7-6 Inspecting cylinder
1. Remove muffler (A) and muffler gasket from
cylinder.
2. Disconnect intake insulator (B) from intake bellows
(C) and pulse line (D) taking care not to damage
them.
3. Remove intake bellows (C) and pulse line (D) from
cylinder. Remove ignition coil (E).
4. Remove 4 bolts (F) securing crankcase.
5. Gently tap both crankshaft ends evenly using
plastic mallet to remove lower crankcase with
crankshaft and piston assembly.
6. Inspect cylinder combustion chamber and clean
with a plastic or wooden scraper if carbon is
deposited.
NOTE: Do not use metal tools, or damage to cylinder
wall may result.
7. Inspect cylinder wall and replace crankcase as a
set if plating is worn, peeled away, scored or
exposing cylinder base metal.
7-7 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, top land, ring groove and
skirt. Clean them with fine sand paper, oil stone, or
ring groove cleaning tool 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.
3. Remove snap rings from both sides of piston pin.
4. Push piston pin out from piston.
NOTE: If piston pin is tight, use piston pin tool
897702-30131 (A) with adapter (B) stamped “8” on
an end.
5. Inspect needle bearing and spacers, and replace
if wear or discoloration is noted.
C
A
B
D
E
F
A
B
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