2000 Yamaha YFM400FWA(M) Factory Service workshop Manual, Page 78Get this manual

2000 Yamaha YFM400FWA(M) Factory Service workshop Manual, Page 78

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COMPRESSION PRESSURE MEASUREMENT ENGINE OIL LEVEL INSPECTION
Measurement steps: Crank over the engine with the electric starter (be sure the battery is fully charged) with the throttle wide-open