2005-2009 Honda TRX400EX/TRX400X Service Manual, Page 77Get this manual
LUBRICATION SYSTEM Install the following into the pump body:outer rotorinner rotordrive pin and pum shah with he stepped side facing the pump body (aligning th drive pin ith the grooves in the inner rotor!dowel pins Assemble the pump body and pump spacer
PUMP SPACER
PUMP BODY Insta ll the fo ll owing onto the pump shaft and in to the pump base:th rus wa sherriv inuter rotorinner rotor Assemble the pump base and pump bodyspaceraligning the drive pin with the grooves in the inner rotor