2003 Yamaha YFM400FAR Kodiak Factory Service Manual, Page 201Get this manual
MIDDLE GEAR
REMOVING THE MIDDLE DRIVE SHAFT 1.Straighten: Punched portion of the nut (middle drive pinion gear) 2.Loosen: Nut (middle drive pinion gear) NOTE: Secure the middle drive shaft in the vise with clean rag3.Remove: Nut (middle drive pinion gear) Middle drive pinion gear Shim(s)