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 muf
fl
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 . R e m o v e c y l i n d e r c o v e r. R e m o v e s t a r t e r
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
Summary of Contents for CS-310
Page 1: ...Ord No 401 33 CS 310 ...
Page 75: ...Printed in Japan 1101 ...
