ENGINE
CS-310
52
8-1 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) in spark
plug hole and tighten by hand. Pull starter several
times to stabilize reading on compression gauge.
3. If pressure is lower than approx. 75% 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.
8-2 Cleaning cooling air passages
1. Remove cylinder cover. Remove starter
assembly (Refer to “2-1 Disassembling starter as-
sembly”).
WARNING DANGER
Always wear eye protection when using
compressed air for cleaning. Otherwise,
eye damage can occur from fl ying particles.
2. Inspect cylinder cooling fins (A) for blockage
with dirt and/or saw dust. Clean them with wooden
or plastic stick or compressed air as required.
3. Install all removed parts.
A
A
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