2005-2008 Honda ATV TRX500FA/FGA Fourtrax, Rubicon Factory Service Manual, Page 369Get this manual

2005-2008 Honda ATV TRX500FA/FGA Fourtrax, Rubicon Factory Service Manual, Page 369

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FRONT DRIVING MECHANISM Replace the pinion shim with thicker one if the contact pattern is too high, toward the faceTOO HIGH:
pinion shim replacementFLANK Drive side FLANK Coast side