Carburetor Basics WM 80 Repair
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Wide-Open Throttle Operation
At wide-open throttle, the choke (a) remains in the open position and
the throttle (b) is wide open. During this state, the throttle plate has little
affect on high- and low-pressure areas within the carburetor throat.
The venturi of the carburetor throat now takes over to create the low-
pressure area. The low pressure created by the venturi draws fuel into
the air stream. It also acts on the metering diaphragm which opens the
needle valve to its furthest-open position, allowing supply fuel into the
lower chamber. Fuel now flows from the main nozzle (e) located within
the venturi. Very little fuel flows from the idle nozzles.
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