2000 Yamaha YFM400FWA(M) Factory Service workshop Manual, Page 78Get this manual
COMPRESSION PRESSURE MEASUREMENT ENGINE OIL LEVEL INSPECTION
INSP ADJ
Compression pressure (at sea level): Standard: 1,400 kPa (14 kgcm2, 203 psi) Minimum: 1,218 kPa (12.2 kgcm2, 177 psi) Maximum: 1,568 kPa (15.7 kgcm2, 227 psi)