2004 Polaris Freedom, Virage, Genesis and MSX-140 Service Manual., Page 136Get this manual
FUELEXHAUST SYSTEMS Carburetor Pop- Off Valve Testing If operating pop off pressure is too high, the amount of fuel available to the engine will be reduced, causing lean conditionHigh pop off pressure may be caused by:
Restricted fuel inlet passage Inlet needle stuck in seat Corrosion on lever arm, lever arm pin, andor return spring Incorrect lever arm return spring (Use only genuine Polaris parts) Fuel return line orifice missing