FUEL AND CARBURETOR
6-10
THROTTLE OPENING VS FUEL FLOW
In a full throttle condition the cross-sectioned area between the
jet needle and the needle jet is larger than the cross-sectioned
area of the main jet. The main jet therefore has greater control
over fuel flow.
THROTTLE SLIDE
The throttle slide controls the rate of engine air intake by
up and down inside the main bore. At small throttle
openings, chiefly the cutaway performs airflow control. By
controlling airflow the negative pressure over the nee
regulated, in turn varying the fuel flow.
Throttle valves are numbered 1.0, 1.5, 2.0, etc., according to
the size of the cutaway. The higher the number, the leaner the
gasoline/air mixture.
MAIN JET
When the throttle opening becomes greater and the main jet
meters the area between the needle jet and jet needle increases,
fuel flow. The number on the jet indicates the amount of fuel
CCs, which will pass through it in one minute under,
controlled conditions. Larger numbers give a greater flow,
resulting in a richer mixture.
Main jets are screwed directly into the needle jet base
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