Wacker Neuson WM 80 User Manual

WM 80 Repair Carburetor Basics
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See Graphic: wc_gr002895
Partial Throttle:
At partial throttle, the throttle shutter is partially opened, allowing a
greater amount of air through the carburetor. The throttle has opened
wide enough to expose the secondary idle discharge port
(a) which
provides more fuel to mix with the air.
In dual-needle versions, engine suction draws fuel from both the
primary
(b) and secondary idle discharge ports. As at idle, the slow
speed mixture needle valve regulates the engine speed. By turning the
valve, the fuel/air mixture can be made richer or leaner, affecting the
engine’s speed (rpm).
In single-needle versions, engine suction also draws fuel from both the
primary (b) and secondary idle discharge ports. And like dual needle
carburetors, the adjustable mixture needle valve regulates the engine
speed. By turning the valve, the fuel/air mixture can be made richer or
leaner, affecting the engine’s speed (rpm).
In fixed-jet, primary-idle-bypass versions, only the secondary
discharge port provides fuel at partial throttle. Both high- and low-
speed jets are fixed; no adjustments to jets can be made.
a
b
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Wacker Neuson WM 80 Specifications

General

Brand	Wacker Neuson
Model	WM 80
Category	Engine
Language	English