1999-2004 Honda TRX400EX FourTrax Service Manual, Page 155Get this manual
CRANKCASElTRANSMlSSlONlCRANKSHAFT Apply oil to new bearingsDrive the mainshaft, crankshaft and balancer bearings in with the marking side facing up using the special tools-
TOOLS: Mainshaft bearing: Driver Attachment, 42 47 mm Pilot, 22 mm
Crankshaft bearing: Driver Attachment, 72 75 mm Pilot, 30 mm Balancer bearing: Driver Attachment, 37 40 mm Pilot, 15 mm
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AND-PILOT
Drive new countershaft oil seal in using suitable 24 mm socketDrive the countershaft bearing in with the sealed side facing down using the special tools