Testing Cylinder Compression; Cleaning Cooling Air Passages - Echo CS-600 Service Manual

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CS-600

8-1 Testing cylinder compression

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.

ENGINE

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.

1. Remove cleaner lid and cylinder cover. Remove

starter assembly (Refer to "2-1 Disassembling

starter assembly").

WARNING

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.

DANGER

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