2007-2009 Honda TRX300EX TRX300X service manual, Page 205Get this manual
CRANKCASETRANSMISSIONCRANKSHAFT Check the reverse idle shaft, mainshaft and countershaft for abnormal wear or damageMeasure the shaft .0 SERVICE LIMITS: AtMS: At C2: AtC321.93 mm (0.863 in) 21.93 mm (0.863 in) 24.93 mm (0.981 in) COUNTER SHAFT
MAINSHAFT SHAFT
Measure the reverse idle shaft 0.0SERVICE LIMITS: Reverse idle: 13.93 mm (0.S48 in)
REVERSE IDLE SHAFT
Calculate the gear bushing-to-shaft clearanceSERVICE LIMITS: MS, C2, C3: 0.10 mm (0.004 in)