2006-2009 Honda TRX250EX/TRX250X Service Manual, Page 216Get this manual
CRANKCASETRANSMISSIONCRANKSHAFT Install the shift forks into gear shifter grooves (RA fork into M3 gear, fork into C4 gear, fork into gear shifter) with each identification mark facing up (front crankcase side) Apply engine oil to the guide grooves and journals of the shift drumInstall the shift drum into the crankcase with the dowel pin hole facing to the left side (neutral position), Set the guide pin of each fork into the guide grooves carefully
Apply engine oil to the shift fork shaftInstall the fork shaft through the shift forks and into the crankcase