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CARBURETTOR

English – 31

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 (fig. 4) the choke valve (D) is fully

closed. This increases the vacuum in the carburettor so that

fuel is sucked more easily from all the diffuser jets (E, F and

G). The throttle valve (H) is partly open.

In the idling mode (fig. 5) the throttle valve (H) is closed. Air

is sucked in through an aperture in the throttle valve and a

small amount of fuel is supplied through the diffuser jet (G).

In the part throttle mode (fig. 6 the throttle valve (H) is partially

open. Fuel is supplied through the diffuser jets (F and G).

In full throttle mode (fig. 7 both valves are open and fuel is

supplied through all three diffuser jets (E, F and G).

Fig. 4 D E F G

Fig. 5 H G

Fig. 6 H F G

Fig. 7 E F G

Jonsered CS2186 Workshop Manual

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