FUEL SYSTEM/CARBURETION
4.4
CV CARBURETOR SYSTEM FUNCTION
Carburetor Component Function
System Main Components Main Function Main Affect
Float System
(Fuel Level Control)
Inlet Pipe, Needle and Seat,
Float, Float Pin
Maintains specified fuel level
in float chamber (carburetor
float bowl)
All systems
All throttle ranges
Venting Vent Passages in Carburetor,
Vent lines (2) into (1) to frame
Supplies atmospheric pres-
sure to fuel in float chamber
All systems
All throttle ranges
Starter
(Choke/Enrichment)
Choke Lever, Cable, Choke
Plunger, Return Spring, Carb
Passages (Starter Jet, Starter
Bleed Pipe)
Supplies additional fuel air
mixture necessary for cold
starting
All throttle ranges
Greatest effect at low throttle
settings and idle
Pilot (Idle System) Pilot J et/Passageways, Pilot-
Mixture Screw with Spring
Washer and Sealing O-Ring,
Bypass Ports (Behind
Throttle Plate), Pilot Air Jet,
Pilot Outlet, Throttle Plate
Primarily supplies fuel at idle
and low throttle settings
Mainly idle to 1/4 throttle
Minimal ef fect after 1/2
throttle
Main System Main J e t, Main Air Jet, Main
Air Passage, Needle J et, Jet
Needle, Vacuum Slide,
Throttle Plate
Supplies fuel at mid-range
and high throttle settings.
1/4 to full throttle
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.
To f ra m e
Vent lines
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