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Yamaha SUPER JET SJ650Q 1991 Service Manual page 43

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ELECTRICAL SYSTEM INSPECTION
3-18
036740-0"
COMPRESSION PRESSURE INSPECTION
1. Warm up the engine and check torque of
the cylinder head.
2. Remove:
•Spark plugs
3.Set:
•Compression gauge
4. Cranking:
Cranking the engine until compression
gauge stops rising.
Compression pressure:
940 kPa (9.4 kg/cm2, 134 psi)
5. Move:
Move the compression gauge to the
other spark plug hole. Follow steps 1
through 4.

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