2006 Honda TRX680 Rincon Factory Service Manual, Page 349Get this manual
DRIVETRAIN SYSTEM CLUTCH RETURN SPRING Measure the spring free lengthSERVICE LIMIT: 31.8 mm (1.25 in)
SHIFT CLUTCHMAINSHAFT ASSEMBLY
MAINSHAFT ASSEMBLY
Blow through the oil passages in the mainshaft with compressed airApply engine oil to the each gear teeth and bearingInstall the snap ring Install the following onto the mainshaft: and washer withM2 gear the chamferedsnap rings (so that its end gap aligns with the (rolled) edge facing groove in the splines) away from theM3 gear (with the ribs facing out) thrust load