2006 Honda TRX680 Rincon Factory Service Manual, Page 338Get this manual
DRIVETRAIN SYSTEM CLEANINGINSPECTION Remove the following:oil filter (page 4-12)dipsticksealing bolts and washersthree bolts and oil pipe joint Wash the crankcase cover with solvent and blow through all the passages with compressed air to clean them thoroughlyOIL PIPE JOINT
DIPSTICK
The feed pipes are supplying engine oil to each shift clutch; A: 1st, B: 2nd and C: 3rd
BOLTS AND WASHERS
Check the feed pipe A, and for abnormal wear or damage