1985-1986 Honda ATC250R Shop Manual, Page 122Get this manual
TRANSMISSIONCRANKSHAFTBALANCER DRIVER 07749-0010000 Install the bearings into the right crankcase using the following tools: Crankshaft bearing: Driver Attachment, 62 68 mm Pilot, 28 mm Mainshaft bearing: Driver Attachment, 52 55 mm Pilot, 25 mm Countershaft bearing: Driver Attachment, 37 40 mm
07749-0010000 07746-0010500 077 46-0041100 077 49-0010000 07746-0010400 077 46-0040600 077 49-0010000 07746-0010200
ATTACHMENT, 37 40 mm 07746-0010200
Install the shift drum bearing into the right crankcase and secure it with the bearing holder plates and bolts