1998-2001 Yamaha YFM600FHM Grizzly Factory Service Manual, Page 100Get this manual
IIANOSJP Ito) VALVE CLEARANCE ADJUSTMENT a.Adjust: Valve clearance
Adjustment steps: Loosen the locknut CD Insert feeler gauge between the adjuster end and the valve end Turn the adjuster clockwise or counterclockwise with the valve adjusting tool until the proper clearance is obtainedValve adjusting tool: PINYM-08035, 90890-01311 Hold the adjuster to prevent it from moving and then tighten the locknut_ Locknut: 14 Nm (1.4 kg, 10 ft Ib)
Measure the valve clearance If the clearance is incorrect, repeat the above steps until the proper clearance is obtained