34 – English
Repair instructions
Function
The carburettor operates differently in the following
modes:
• Cold start mode
• Idling mode
• Part throttle mode
• Full throttle mode
In the cold start mode (see gure) the choke valve
(H) is fully closed. This increases the vacuum in
the carburettor so that fuel is sucked more easily
from all the diffuser jets (D, E and F). The throttle
valve (I) is partly open. Extra air inlet (J) is closed
(see gure 25).
In the idling mode (see gure) the throttle valve (I
and J) is closed and the choke valve (H) is open.
Air is sucked in through an aperture in the throttle
valve and a small amount of fuel is supplied th-
rough the diffuser jet (D) (see gure 26).
In the part throttle mode (see gure below) the th-
rottle valve (I) is partially open and the choke valve
(H) is open. Fuel is supplied through the diffuser
jets (D and E). The throttle valve (J) starts to open
(see gure 27).
In full throttle mode (se gure below) all valves
are open and fuel is supplied through all diffuser
jets (D, E, F and G). Extra air inlet (J) is also fully
opened (see gure 28).
Fig 25
Fig 26
Fig 27
Fig 28
