2005 Ski-Doo Racing Handbook, Page 384Get this manual
SECTION 082005 MX 550 AND 380 FC
ADJUSTMENT
Oil Pump Cable
377 and 552 Engines Prior to adjusting the pump, make sure all carburetor adjustments are completed and engine is stoppedEliminate the throttle cable free-play by pressing the throttle lever until light resistance is felt, then hold in placeThe mark on the pump casting and on the lever must alignWidth of lever mark is the toleranceLoosen the adjuster nut and adjust accordinglyRetighten the adjuster nutA32C57A
APPLY LOCTITE ON THIS AREA ONLY
Install the check valve in the correct position as described on next photos into the crankcase lower side