40 – English
G
Fig 38
Fig 40
Fig 39
Function
The carburettor functions differently in the following
modes:
• Cold start mode
• Idle mode
• Part throttle mode
• Full throttle mode
In cold start mode the choke valve, H, is completely
shut. This increases the vacuum in the carburettor
and fuel is easier to suck from all the diffuser jets,
D, E and F. The throttle valve, I, is partly open. The
throttle valve, J, is closed. See gure 37
In idling mode, the throttle valves, I and J, are
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 through
the diffuser jet, D. See gure 38.
In part throttle mode, the throttle valve, I, is partly
open and the choke valve, H, is fully open. Fuel
is supplied through the diffuser jets, D and E. The
throttle valve, J, starts to open. See gure 39
In the full throttle mode both valves are open and
fuel is supplied through all four diffuser jets, D, E,
F and G. The throttle valve, J, is fully open. See
gure 40
Fig 37
Repair instructions
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