Husqvarna 335XPT Workshop Manual page 26

Operation
The carburettor operates differently in the following modes:
Cold start mode
In the cold start mode the choke valve (D) is fully closed. This
increases the vacuum in the carburettor and fuel is easier to
suck from all the diffuser jets (E, F and G). The throttle valve (H)
is partly open.
Idling mode
In the idling mode (H) the throttle valve 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 (F).
Part throttle mode
In the part throttle mode the throttle valve (H) is partially open.
Fuel is supplied through the diffuser jets (F and G).
Full throttle mode
In the full throttle mode both valves are open and fuel is
supplied through all three diffuser jets (E, F and G).
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– English
CARBURETTOR