CARBURETTOR
English – 29
Fig. 4
D
E
F
G
Fig. 5 H
G
Fig. 6 H
F G
Fig. 7
E F G
Function
The carburettor operates differently in the following
operating states:
• Cold
start
• Idling
• Part
throttle
• Full
throttle
In cold start mode (fig. 4), the choke butterfly (D) is
completely closed. This increase the vacuum in the
carburettor so that fuel is sucked more easily from the
diffuser jets (E, F and G). The throttle butterfly (H) is
partially open.
In idling mode (fi g. 5) the throttle butterfl y (H) is closed.
Air is sucked through an aperture in the butterfl y and a
small amount of fuel is supplied through the diff user jet (G).
In part throttle mode (fi g. 6) the throttle butterfl y (H) is
partially open. Fuel is supplied through the diff user jets
(F and G).
In full throttle mode (fi g. 7) both butterfl ies are open and
fuel is supplied through all three diff user jets (E, F and G).
