Jonsered CS2186 Workshop Manual page 33

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).
CARBURETTOR
Fig. 4
Fig. 5
Fig. 6
Fig. 7
D E F G
H G
H F
E F
G
G
English – 31