1986-1987 Honda TRX350 FourTrax 4X4, 1987-1989 TRX350D Foreman 4X4 Service Manual, Page 225Get this manual
FRONT DIFFERENTIALFINAL DRIVE INSPECTION Measure and record the height of the clutch springSERVICE LIMIT: 2.5 mm (0.09 in)
Check the clutch discs for scoring or discoloration Measure the thickness of each disc SERVICE LIMITS: DISC A: 2.4 mm (0.09 in) DISC B: 2.1 mm (0 .08 in) NOTE The clutch disc has lining material on its inward facing side Inspect the clutch plate surface for excessive scores or discoloration (purple) and replace if necessary