2002 Yamaha YFM660 Grizzly factory service and repair manual, Page 102Get this manual
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MEASURING THE COMPRESSION PRESSURE
Compression pressure (at sea level): Standard: 1,324 kPa (13.24 kgcm2, 188.31 psi) Minimum: 1,150 kPa (11.5 kgcm2, 163.57 psi) Maximum: 1,480 kPa (14.8 kgcm2,