2005-2009 Honda TRX400EX/TRX400X Service Manual, Page 185Get this manual
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CRANKCASETRANSMISSIONCRANKSHAFT
Crankshaft
M4 M5 Cl C2, C3, CRReverse idle Gear bushing .0 M4 M5 C1 ci, C3, CR Reverse id le Gear (mainshaft and counter shaft)to-bushing clearance 0