FUEL SYSTEM/CARBURETION
3.6
PILOT SYSTEM (0-3/8 THROTTLE)
The pilot system’s main function is to meter fuel at idle and low speed driving. Though its main function is to supply
fuel at low speed, it does feed fuel continuously throughout the entire operating range.
Fuel for the pilot jet is drawn from the float bowl, mixed with air regulated by the air screw, and delivered to the
engine through the pilot outlet.
The mixture is regulated to some degree by adjusting the air screw. When the air screw is closed, the fuel mixture
is made richer as the amount of air is reduced. When the air screw is opened, the mixture is made more lean
as the amount of air is increased.
Throttle Valve
Throttle Stop (Idle Speed) Screw
By-
pass
Pilot Outlet
Air Screw
Pilot Jet
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