1997 Yamaha YFM600FWAK ATV Service Manual, Page 220Get this manual
REAR AXLEFINAL DRIVE GEAR AND DRIVE SHAFT
FINAL DRIVE PINION GEAR AND RING GEAR POSITIONING When the final drive pinion gear, ring gear, final gear case andor ring gear bearing housing are replaced, be sure to adjust the positions of the final drive pinion gear and ring gear using the shim(s)
Final drive pinion gear shim(s) selection 1.Select: Final drive pinion gear shim(s) CD
Shim selection steps: eTo find the final drive pinion gear shim thickness "A", use the following formula
Final drive pinion gear shim thickness: A" _(Q)