1997 Yamaha YFM600FWAK ATV Service Manual, Page 213Get this manual
CONSTANT VELOCITY JOINTS AND DIFFERENTIAL GEAR 1DRIV 1
5.Measure: Gear lash Gently rotate the gear coupling from engagement to engagementDifferential gear lash: 0.05 0.25 mm (0.002 0.010 in)
Measure the gear lash at four positionsRotate the shaft 90 each time