ENGINE
43
SRM-2620ES, SRM-2620TES
T262XS, C262S
T262TXS, C262TS
6-1 Testing cylinder compression
NOTE:
Test cylinder compression when engine is
cold.
1. Move ignition switch to STOP position. Then re-
move spark plug.
2. Install compression gauge 91037 (A) with
Adapter P021-051690 (B) in spark plug hole and
tighten by hand. Pull starter several times to stabi-
lize reading on compression gauge.
3. If pressure is lower than approx. 80% of
standard compression pressure (Refer to “1-2
Technical data ”), inspect cylinder bore, piston, and
piston ring for wear or damage.
4. If pressure is more than approx. 125% of standard compression pressure, inspect cylinder combustion
chamber and exhaust port, piston crown, and muffl er for carbon deposits.
NOTE:
Compression pressure varies with volume of compression gauge tip occupying cylinder combus-
tion chamber. If gauge tip volume is considerably different from spark plug volume, it is recommended to
measure and note compression pressure of brand-new engines as standard pressure in advance.
6-2 Cleaning cooling air passages
1. Inspect muffl er cover (A). If blocked with leaves
or other debris, clean out debris as required.
2. Remove cylinder cover (B) and air cleaner cover
(C).
3. Inspect cylinder cooling fins (D) for blockage
with dirt or dust.
4. Clean all other air passages with wooden stick
or compressed air as required.
WARNING DANGER
Always wear eye protection when using
compressed air for cleaning. Otherwise,
eye damage can occur from fl ying particles.
A
B
A
B
C
D
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