1998-2004 Honda Foreman 450 factory service manual, Page 351Get this manual
REAR DRIVING MECHANISM If the patterns are not correctremove and replace the pinion spacer with one of an alternate th icknessReplace the pin ion spacer with th icker one if the contacts are too high, toeard the faceReplace the pinion spacer with thinner one if the contacts are too low, to the flank sideThe pattern will shift about 0.51.0 mm (0.0020.04 in) when the thickness of the spacer is changed by 0.10 mm (0.004 in)
TOO HIGH:
PINION SPACERS ([ 1: After '01): [AI: 1.64 mm (0.064 in) [B]: 1.70 mm (0.067 in) [C]: 1.76 mm (0.069 in) [D]: 1.82 mm (0.072 in) [E]: 1.88 mm (0.074 in) [F]: 1.94 mm (0.076 in) [G]: 2.00 mm (0.079 in) [H]: 2.06 mm (0.081 in) [I]: 2.12 mm (0.083 in) [J]: 2.18 mm (0.086 in)