1987 Honda Fourtrax TRX 250X Service Manual, Page 131Get this manual
CRANKCASETRANSMISSIONCRANKSHAFT Install new crankshaft bearing
(1DRIVER
TOOLSDriver
Attachment62 68 mm
Pilot, 28 mm
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RIGHT CRANKCASE
Remove the bearings
Install new bearings as following tools
(1) DRIVER
Balancer bearing Driver Attachment, 37 40 mm