2003 Yamaha YFM400FAR Kodiak Factory Service Manual, Page 254Get this manual
REAR AXLEFINAL DRIVE GEAR AND DRIVE SHAFT
MEASUREMENT AND ADJUSTING THE FINAL GEAR LASH Final gear lash measurement 1.Secure the gear case in vise or another supporting device2.Remove: Drain plug Gasket 3.Install: bolt of the specified size (into the drain plug hole)
CAUTION:
Finger tighten the bolt until it holds the ring gearOtherwise, the ring gear will be damaged