2-18
COMPRESSION PRESSURE
INSP
ADJ
1
2
COMPRESSION PRESSURE
TIP
Measure the compression after checking and
adjusting the valve clearance.
1. Warm up the engine for several minutes.
2. Remove:
9
Rear cover 1
Refer to “COVERS AND FUEL TANK”.
3. Remove:
9
Spark plug cap
9
Spark plug
4. Connect:
9
Compression gauge
1
9
Adapter
2
5. Measure:
9
Compression
To measure the compression, pull the
recoil starter until the needle stops ris-
ing on the compression gauge.
To prevent sparking when cranking the
engine, ground the high tension cord.
WARNING
Compression gauge:
YU-33223, 90890-03081
Adapter:
YU-33223-3, 90890-04082
Standard compression pressure:
Auto decompression deactivated
800 – 950 kPa (8.0 – 9.5 kg/cm
2
,
116 – 137.75 psi) at 1100 r/min
Auto decompression activated
400 – 500 kPa (4.0 – 5.0 kg/cm
2
,
58 – 72.5 psi) at 600 r/min
7DK40-02 6/15/09 2:58 PM Page 37
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