2006-2012 Honda TRX90 TRX90EX/X Service Manual, Page 145Get this manual
CLUTCHGEARSHIFT LINKAGE Clutch disc
Replace the clutch discs if they show signs of scoring or discolorationMeasure the disc thickness of each discSERVICE LIMIT: 2.60 mm (0.102 in)
Clutch plate
Check the disc plate for warpage on surface plate using feeler gaugeSERVICE LIMIT: 0.10 mm (0.004 in)