Service manual

(
PRIMARY (MAIN FUEL) SYSTEM
(See fig. 2-6)
)
(Throttle
1
/4 Open To Full Open)
1. Velocity of air flowing through needle jet in-
creases. Differential pressure increases to
force fuel flow.
2. Throttle Valve
1
/4 to% open.
a. Fuel passes through main jet.
b. Fuel is metered in the clearance between
the needle jet and the jet needle.
c. Fuel is mixed with air in the needle jet.
d. The mixture is injected into the main
bore, and mixed with the main air flow as
it is transported to the engine.
3. Throttle valve% to full open.
a. Fuel is metered by the main jet.
SERVICE MANUAL - 1975 SCORPION BRUT
AIRFLOW
JET NEEDLE
NEEDLE
JET
THROTTLE
VALVE
FIG. 2-6
2-5