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35

Repair Instructions

The carburettor operates differently in the following 

modes:

•  Cold start mode

•   Idling 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 figure 30.

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 figure 31.

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 figure 32.

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 

figure 32.

Fig 30

Fig 31

Fig 32

Fig 33