2003 Arctic Cat ATVs from 250cc to 500cc Service Manual, Page 286Get this manual
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3Install the oil pump onto the engine; then tighten the Phillips-head screws securely
After completing center crankcase components, proceed to Installing Right-Side Components, to Installing Left-Side Components, and to Installing Top-Side Components
Installing Right-Side Components
1Install the shift indicator sending unit making sure the two neutral contact pins and the two springs are properly positionedTighten the Allen-head screws securelyCC613
4Install the oil pump drive gear spacer onto the crank balancer shaftGrease the pin and insert it into the shaft; then install the drive gear making sure the raised side of the gear is facing toward the insideSecure the gear with the cap screw (threads coated with red Loctite #271) and the washerTighten the cap screw to kg-m (36 ft-Ib)