2001 Arctic Cat ATVs factory service and repair manual, Page 256Get this manual
8Insert the jet needle into the piston valve making sure it enters the center hole at the bottomPlace the plastic washer down on top of the jet needle making sure it sits flat with the end of the needle positioned in the center of the washerFig4-40
9Push the diaphragm downward as identified in the following figure; then insert the piston valve into the carburetor body with the four dimples positioned toward the engineFig4-41