Cv Carburetor System Function (4 Cycle) - Polaris Sportsman 400 Service Manual

CV CARBURETOR SYSTEM FUNCTION
System
Float System Inlet Pipe, Needle and Seat,
(Fuel Level Control) Float, Float Pin
Venting Vent Passages in Carburetor,
Vent lines (2) into (1) to frame
Starter Choke Lever, Cable, Choke
(Choke/Enrichment) Plunger, Return Spring, Carb
Passages (Starter Jet, Starter
Bleed Pipe)
Pilot (Idle System) Pilot Jet/Passageways, Pilot-
Mixture Screw with Spring
Washer and Sealing O-Ring,
Bypass Ports (Behind
Throttle Plate), Pilot Air Jet,
Pilot Outlet, Throttle Plate
Main System Main Jet, Main Air Jet, Main
Air Passage, Needle Jet, Jet
Needle, Vacuum Slide,
Throttle Plate
VENT SYSTEMS - CV CARBURETOR
The carburetor float bowl vent lines supply atmospheric
pressure to the fuel in the float bowl. The lines must be
free of kinks and restrictions and be properly routed to al-
low fuel to flow in the proper amount and to prevent con-
taminants from entering the carburetor.
- projex@inbox.lv -
Carburetor Component Function
Main Components
Maintains specified fuel level
in float chamber (carburetor
float bowl)
Supplies atmospheric pres-
sure to fuel in float chamber
Supplies additional fuel air
mixture necessary for cold
starting
Primarily supplies fuel at idle
and low throttle settings
Supplies fuel at mid-range
and high throttle settings.
FUEL SYSTEM/CARBURETION
Main Function
All systems
All throttle ranges
All systems
All throttle ranges
All throttle ranges
Greatest effect at low throttle
settings and idle
Mainly idle to 1/4 throttle
Minimal effect after 1/2
throttle
1/4 to full throttle
To frame
Main Affect
Vent lines
4.5