Venting Systems (Mikuni Cv) - Polaris Magnum 2x4 Service Manual

FUEL SYSTEM/CARBURETION
Mikuni CV Carburetor System Components
Venting Systems
The fuel tank vent line supplies atmospheric pressure to the fuel in the tank. It must be free of kinks and restric-
tions and be properly routed to allow fuel to flow from the tank and prevent contaminants from entering the tank.
The line should be routed into the center of the steering post.
The carburetor float bowl vent lines supplies atmospheric pressure to the fuel in the float bowl. It must be free
of kinks and restrictions and be properly routed to allow fuel to flow in the proper amount and to prevent contami-
nants from entering the carburetor.
System Main Components Main Function Main Affect
Float System (Fuel Level Inlet Pipe, Needle and Seat, Maintains specified fuel lev- All systems
Control) Float, Float Pin el in float chamber (carbure- All throttle ranges
tor float bowl)
Venting Vent Passages in Carbure- Supplies atmospheric pres- All systems
tor, Vent lines (2) into (1) to
sure to fuel in float chamber All throttle ranges
frame
Starter (Choke/Enrichment) Choke Lever, Cable, Choke Supplies additional fuel air All throttle ranges
Plunger, Return Spring, mixture necessary for cold Greatest effect at low
Carb Passages (Starter Jet, starting throttle settings and idle
Starter Bleed Pipe)
Pilot (Idle System) Pilot Jet/Passageways, Pi- Primarily supplies fuel at idle Mainly idle to 1/4 throttle
lot-Mixture Screw with and low throttle settings Minimal effect after 1/2
Spring Washer and Sealing throttle
a-Ring, Bypass Ports (Be-
hind Throttle Plate), Pilot Air
Jet, Pilot Outlet, Throttle
Plate
Main System
Main Jet, Main Air Jet, Main Supplies fuel at mid-range 1/4 to full throttle
Air Passage, Needle Jet, Jet and high throttle settings.
Needle, Vacuum Slide,
Throttle Plate
7/96 4.24
Polaris Industries Inc.