2004 Polaris Freedom, Virage, Genesis and MSX-140 Service Manual., Page 136Get this manual

2004 Polaris Freedom, Virage, Genesis and MSX-140 Service Manual., Page 136

FUELEXHAUST SYSTEMS Carburetor Pop- Off Valve Testing If operating pop off pressure is too high, the amount of fuel available
the Mity Vact to the fuel inlet fitting of the carburetor to be tested4Plug the fuel return outlet of the carburetor to be
tested5Pressurize the carburetor with the pump until the needle valve pops offPump slowly and note the pressure when the
valve opensTest the valve at least three times to ensure an accurate readingBe sure to keep the needle valve wetNOTE: The
reason for wetting the needle valve is to duplicate actual conditions during operationWhen the engine is running, the needle
valve has fuel running through to wet it and engine vibrations to help the needle obtain good sealApply 10-18 PSIThe carburetors
should hold pressure at no less than 5-8 PSIOtherwise see pop off pressures listed in the specifications in the beginning