1985-1986 Honda ATC250R Shop Manual, Page 116Get this manual
TRANSMISSIONCRAN KSHAFT BALANCER
Inspect the shift drum grooves and replace the drum if they are damaged or show excessive wear
Inspect each gear for wear or damage and replace if necessaryCheck the gear teeth for wear or damageCheck the engagement dogs of gears for wear or damage
Measure the 1.0of each geal
SERVICE LIMIT:
M6 M5 C1 C2 C3 C4
25.06 28.05 22.06 27.06 28.06 25.06