2005-2009 Honda TRX400EX/TRX400X Service Manual, Page 204Get this manual
CRANKCASETRANSMISSIONCRANKSHAFT Insta ll the four right crankcase bo lts
Insta ll the ten left crankcase bo ltsTighten the all the bolts crisscross pattern in several steps
Install he tim ing sprocket by alig ning he ide spline in the sprocket with the grooved sp li ne of the crankshaftApply engi ne oil the cam chain an install it onto the sprocket through he crankcase