2001 Polaris SLX, PRO 1200, Virage TX, Genesis, Virage TXi, Genesis i Personal Watercraft Service Manual, Page 155Get this manual
CarburetionExbaust 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
Testing Needle and Seat Pop Off Pressure
1Pressure test each carburetor individuallyTo provide accurate readings remove the regulator diaphragm and its cover before testingWet the needle with WD40 or similar substanceNOTE: Do not use gasoline due to the hazard of fireProtect your eyes from the spray when the needle valve "pops off"2Remove the fuel lines connecting the carburetors3Attach the Mity Vac 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 seal1M 1M