2000 Yamaha YFM400FWA(M) Factory Service workshop Manual, Page 260Get this manual
REAR AXLEFINAL DRIVE GEAR AND DRIVE SHAFT
FINAL DRIVE GEAR ASSEMBLY 1.Install: Drive pinion gear (with shim(s) and bearing) (proper shim size as calculated) Bearing retainer (drive pinion gear) 1
100 Nm (10.0 kg, 72 ft lb)
Use bearing retainer wrench 2