2005-2006 Honda ATV TRX500FE/FM/TM FourTrax Foreman Factory Service Manual, Page 219Get this manual
CRANKCASETRANSMISSIONCRANKSHAFTBALANCER Apply engine oil to the shift drum guide pin groovesInstall the shift drum with the dowel pin hole facing the fork shaft sideInstall each shift fork into the gear shifter grooves and shift drum groove with their identification marks facing up (front crankcase side)- POR fork into M3 gearfork into C4 gearFR fork into gear shifter on countershaft
Apply engine oil to the fork shaftInstall the fork shaft through the shift forks and into the crankcase