2000 Yamaha YFM400FWA(M) Factory Service workshop Manual, Page 206Get this manual
MIDDLE GEAR
Shims are supplied in the following thicknessMiddle drive pinion gear shim 0.10 0.15 0.20 0.30 0.40 0.50 0.60
Thickness (mm)
MIDDLE DRIVEN SHAFT INSTALLATION 1.Install: Bearing retainer 1
80 Nm (8.0 kg, 58 ft lb)