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Carburetor Adjustments & Tuning Tips
CARBURETOR CIRCUIT FUNCTIONS
e carburetor has several circuits, each providing the fuel/air mixture over
a given portion of throttle valve opening.
ese circuits overlap as show below.
MAIN JET
e main jet aects fuel/air ratio from half (1/2) to full throttle (4/4). e
size should be reduced at higher altitudes.
MAIN JET
JET NEEDLE (TAPERED SECTION)
JET NEEDLE
(STRAIGHT SECTION)
SLOW JET
PILOT SCREW
1/8 1/4 1/2 3/4
FULLY
CLOSED
FULLY
OPEN
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