1997-2001 Honda TRX250 Fourtrax Recon Service Manual, Page 272Get this manual
REAR DRIVING MECHANISM If th patterns are not correct, remove and replace th pinion spacer wi th one of an alternate th icknessReplace th pinion spacer with thicker one if the contacts are too high, toward the faceReplace the pinion spacer with thinner one if the contacts are too low, to the flank sideThe pattern wi ll shift about 0.5 1.0 mm (0 .02 0.04 inwhen the thickness of the spacer is chan ged by 0.10 mm (0 .004 in)
TOO HIGH:
PINION SPACER
PINION SPACERS: :l.64 mm (0.064 in) :1.70 mm (0.067 in) C:l .76 mm (0.069 in) :1.82 mm (0.072 in) E: 1.88 mm (0 .074 in) F: 1.94 mm (0076 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)