2005-2011 Honda FourTrax Foreman TRX500 FE/FPE/FM/FPM/TM Service Manual, Page 357Get this manual
FRONT DRIVING MECHANISM (Except TM model) Replace the pinion shim with thinner one if the contact pattern is 100 low, toward the flankThe pattern wilt shift about 0.51.0 mm (0.020.04 in) when the thickness of the shim is changed by 0,12 mm (0.005 in )NOTE:
PINION GEAR SHIM
Fifteen different thickness shims are available from the thinnest (1 .64 mm thickness: Al shim to the thickest (2.48 mm thickness: 0) in intervals of 0.06 mmPinion gear shim s:(thinnest): 1.64 mm (0.065 inG: (st andard): 2.00 mm (0.019 in)(thickest): 2.48 mm (0.098 inRefer to procedure for pinion shim replacementFLANK Drive side
FLANK Coast side
pinion gear removal (page 16-22) pinion gear installation (page 16-26)