Jonsered CS 2172 WH - Page 27

CARBURETTOR
English – 27
Fig. 4 D E F G
Fig. 5 H G
Fig. 6 H F G
Fig. 7 E F G
Function
The carburettor operates differently in the following
operating states:
• Cold start
• Idling
• Part throttle
• Full throttle
In cold start mode (g. 4), the choke buttery (D) is
completely closed. This increase the vacuum in the
carburettor so that fuel is sucked more easily from the
diffuser jets (E, F and G). The throttle buttery (H) is
partially open.
In idling mode (g. 5) the throttle buttery (H) is closed.
Air is sucked through an aperture in the buttery and a
small amount of fuel is supplied through the diffuser jet (G).
In part throttle mode (g. 6) the throttle buttery (H) is
partially open. Fuel is supplied through the diffuser jets
(F and G).
In full throttle mode (g. 7) both butteries are open and
fuel is supplied through all three diffuser jets (E, F and G).