2007-2009 Honda TRX300EX TRX300X service manual, Page 160Get this manual
CLUTCH Replace the clutch discs and plates as set
CLUTCH DISC Check the clutch discs for signs of scoring or discoloration Measure the thickness of each discSERVICE LIMIT: 2.6 mm (0.10 in)
CLUTCH CENTER Check the grooves of the clutch center for damage or wea caused by the clutch plateReplace if necessaryCLUTCH CENTER
CLUTCH OUTER Check the slots in the clutch outer for nicks, cuts or indentations made by the clutch discsCheck the primary driven gear teeth for wear or damageMeasure the clutch outer 1.0SERVICE LIMIT: 28.05 mm (1.104 in)