2005-2009 Honda TRX400EX/TRX400X Service Manual, Page 196Get this manual

2005-2009 Honda TRX400EX/TRX400X Service Manual, Page 196

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CRANKCASETRANSMISSIONCRANKSHAFT Apply engine oil to the gear teeth and install the reverse idle shaft into the left crankcaseREVERSE IDLE SHAFT
drop the thrust

Install the mainshaft