1998-2001 Yamaha YFM600FHM Grizzly Factory Service Manual, Page 252Get this manual

1998-2001 Yamaha YFM600FHM Grizzly Factory Service Manual, Page 252

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REAR AXLEFINAL DRIVE GEAR AND DRIVE SHAFT
a numeral (usually decimal number) on the final gear case is either added to or subtracted from 45= numeral (usually decimal number) on outside of ring