2001 Polaris Sportsman 400-500 DUSE and H.O. Service Manual, Page 155Get this manual
FUEL SYSTEMCARBURETION
CV CARBURETOR SYSTEM FUNCTION
Carburetor Component Function System Float System (Fuel Level Control) Venting Starter (ChokeEnrichment) Main Components Inlet Pipe, Needle and Seat, Float, Float Pin Vent Passages in Carburetor, Vent lines (2) into (1) to frame Main Function Maintains specified fuel level in float chamber (carburetor float bowl) Supplies atmospheric pressure to fuel in float chamber Main Affect All systems All throttle ranges All systems All throttle ranges All throttle ranges Greatest effect at low throttle settings and idle Mainly idle to 14 throttle Minimal effect after 12 throttle
Choke Lever, Cable, Choke Supplies additional fuel air Plunger, Return Spring, Carb mixture necessary for cold Passages (Starter Jet, Starter starting Bleed Pipe) Pilot JetPassageways, PilotMixture Screw with Spring Washer and Sealing O-Ring, Bypass Ports (Behind Throttle Plate), Pilot Air Jet, Pilot Outlet, Throttle Plate Main Jet, Main Air Jet, Main Air Passage, Needle Jet, Jet Needle, Vacuum Slide, Throttle Plate Primarily supplies fuel at idle and low throttle settings