2006-2009 Honda TRX680 (TRX 680 FA-FGA) Factory Service Manual, Page 502Get this manual
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REAR DRIVING MECHANISM FIN AL GEAR CASE ASSEMBLY NO TE: hen the gear set, bearing, ando gear case has been replaced, chec the tooth contact patte rn check (page 19- 18 JCheck he gea backlash (page 19