Wacker Neuson WM 80 User Manual

Carburetor Basics WM 80 Repair
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See Graphic: wc_gr002896
Full Throttle:
The wider the throttle shutter opens, the more air that will flow through
the carburetor. As the air reaches the venturi (c), it is forced to flow
faster to keep the same volume of air flowing. The faster the air flows
through the venturi, the lower the air pressure in the venturi becomes.
When the air pressure becomes lower than the pressure (atmospheric)
on the fuel in the fuel chamber (d), fuel will flow out through the main
discharge port (e) into the throat of the carburetor. The fuel mixes with
the air stream, flows through the carburetor adapter, and into the
engine crankcase.
In summary, the wider the throttle is open, the faster the air will flow.
The faster the air flows, the lower the air pressure. The lower the air
pressure, the more fuel that will flow out. The more fuel that flows out,
the faster the engine runs. This phenomenon is true at any speed and
allows the carburetor to maintain the same approximate fuel-to-air ratio
as the throttle shutter (flow of air) varies.
The fuel will also flow out of the secondary discharge port and, in dual-
and single-needle versions, out of the primary idle port as well.
wc_gr002896
e
d
c

Wacker Neuson WM 80 Specifications

General

Brand	Wacker Neuson
Model	WM 80
Category	Engine
Language	English