2003 2005 YFM45FAR, YFM450FAR Kodiak OEM Service Manual, Page 213Get this manual
MIDDLE GEAR
4.Check: O-ring Damage ReplaceG Bearings Pittingdamage Replace5.Check: U-joint movement Roughness Replace U-joint
SELECTING THE MIDDLE DRIVE AND DRIVEN GEAR SHIM When the drive and driven gear, bearing housing assembly andor crankcase replaced, be sure to adjust the gear shim 11.Select: Middle drive gear shim Middle driven gear shim Selection steps: Position middle drive and driven gear by using shims and with their respective thickness calculated from information marked on crankcase, bearing housing and drive gear end1 Shim thickness "A" Shim thickness "B"