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FUEL SYSTEM
CARBURETOR OPERATION
CARBURETOR OPERATION
Float System
Idling/Trolling
After passing through the pilot jet, fuel mixes with air supplied from the pilot air jet.
This mixture passes through the pilot screw seat and is jetted from the pilot outlet and bypass port #1.
No mixture is jetted either from the bypass port #2 or from those located upstream. These ports serve as
air passages.
As the pilot screw is turned clockwise (screwed in), the mixture (A/F) will become leaner. As the screw is
turned counterclockwise (screwed out), the mixture will become richer.
The throttle stop screw adjusts idling/trolling speed. When the stop screw is turned clockwise (screwed
in), the speed raises and when turned counterclockwise (screwed out), the speed lowers.
Fuel inlet joint
Float valve
Float pin
Float valve seat
Float
FUEL
AIR
FUEL+AIR (MIXTURE)
FUEL
1 Pilot jet
2 Pilot air jet
3 Pilot outlet
4 Bypass port #1
5 Pilot screw
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