1998-2001 Yamaha YFM600FHM Grizzly Factory Service Manual, Page 254Get this manual
REAR AXLEFINAL DRIVE GEAR AND DRIVE SHAFT
IDRIVII
Remove the ring gea(assembly Measure the thrust clearanceCalculate the width of the flattened Plastigauge CD
Ring gear thrust clearance: 0.1 0.2 mm (0.004 0.008 in)
f out of specification, select the correct washer
Thrust washer selection steps: .Select suitable thrust washer using the following chartThrust washer Thickness (mm) 1.2 1.8 1.4 2.0