2005-2009 Honda TRX400EX/TRX400X Service Manual, Page 196Get this manual
CRANKCASETRANSMISSIONCRANKSHAFT Apply engine oil to the gear teeth and install the reverse idle shaft into the left crankcaseREVERSE IDLE SHAFT
Check the ransm ission gears for freedom of movement and rotation on the shaft Apply engine oil to the gear teeth and gear shifter grooves (M23C4 and C5) Engage th mai nshaft and countershaft gears,
: Gear teeth and shifter grooves
COUNTERS HAFT
MAINSHAFT Apply grease to the countershaft oi seal Posit ion the crank weights so that they do not interfere ith the ma inshaftTake care nO lro