2006-2009 Honda TRX250EX/TRX250X Service Manual, Page 210Get this manual
CRANKCASETRANSMISSIONCRANKSHAFT Turn the crank weights away from the mainshaft so they do not interfere with the mainshaft gearsRemove the mainshaft and countershaft as an assembly
MAINSHAFT
Remove the countershaft oil seal
For crankcase bearing replacement, see page 12-17
Do not expand the snap nng more (han necessary for removal
Disassemble the mainshaft and countershaftClean all disassembled parts in solvent thoroughlyNOTE: Keep track of the disassembled parts (gears, bushings, washers and snap rings) by sliding them onto tool or slipping them onto piece of wire