1998-2004 Honda Foreman 450 factory service manual, Page 349Get this manual
REAR DRIVING MECHANISM If backlash is too small, replace the ring gear left side spacer with thicker oneBacklash is changed by about 0.06 mm (0.002 in) when thickness of the spacer is changed by 0.12 mm (0.005 in)
RIGHT RING GEAR SPACER
RING GEAR SPACERS:
Nine spacers (from to I) are available in thickness intervals of 0.06 mm Standard: 2.00 mm (0.079 In) Thinnest: 1.82 mm (0.072 in) Thickest: 2.30 mm (0.091 inl Change the right side spacer and equal thickness LEFT RING GEAR SPACER and opposite amount of what the left side spacer was changed; if the left spacer was replaced with 0.12 mm (O.005 in) thicker spacer, replace the right 10 spacer with one that is 0.12 mm (0.005 in) thinner