2011 Arctic Cat 400 TRV ATV Service Manual, Page 74Get this manual
CAUTION
It is important to press down on the pump housing until it contacts the carburetor to make sure the diaphragm lip is properly seated in the groove in the carburetorIf the diaphragm is not properly seated, leakage will occur
3Place the throttle cable into position and secure by tightening the outer jam nut
8Place the jet needle, spring seat, and spring into the vacuum piston; then place the assembly down into the carburetor