2005-2006 Honda ATV TRX500FE/FM/TM FourTrax Foreman Factory Service Manual, Page 213Get this manual
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CRANKCASETRANSMISSIONCRANKSHAFTBALANCER Check the reverse idle shaft, mainshaft countershaft for abnormal wear or damageMeasure the shaft O.DSERVICE LIMITS: At M4: 21.93 mm (0.863 in) At M5: 16.93 mm