1998-2001 Honda Fourtrax Foreman TRX450S, TRX450ES Factory Service Manual, Page 322Get this manual
REAR DRIVING MECHANISM If backlash is too sma llreplace the ring gear left side sp,acer with thicker oneSacklash is changed by about 0.06 mm (0.002 in) when thickness of the spacer is changed by 0.1 mm (0.005 in)RING GEAR SPACERS:
Nine spacers (from to Il are available in thickness Intervals of 0.06 mm, Standard: 2.00 mm (0.079 in} Thinnest: 1.82 mm (0.072 inl Thickest: 2.30 mm (0.091 in) Change he right side spacer and equal thickness LE FT RING GEAR SPACER an opposite amount of what the left side spacer was changed; if the left spacer was replaced with 012 mm (0.005 in) thicker spacer, repl.ace the right 10 mm BOLTS space it ne that is 0.12 mm (0.005 In} th inner