2000 Yamaha YFM400FWA(M) Factory Service workshop Manual, Page 200Get this manual
MIDDLE GEAR
MIDDLE DRIVE SHAFT REMOVAL 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)
MIDDLE DRIVEN SHAFT REMOVAL 1.Remove: Universal joint