2005-2008 Honda ATV TRX500FA/FGA Fourtrax, Rubicon Factory Service Manual, Page 239Get this manual
SUB-TRANSMISSIONGEARSHIFT LINKAGE Align the index lug of the shift drum with the index line on the gearshift spindleSHIFT DRUM INDEX LUG
INDEX LINE Remove the following: shift drum while lowering the stopper arm with screwdriver
GEARSHIFT SPINDLE
SHIFT DRUM
STOPPER ARM bolt and setting plate gearshift spindle pivot bolt, stopper arm, washer and spring