Carburetor Basics WM 80 Repair
58 wc_tx000522gb.fm
In single-needle versions (2), the throttle shutter does not open and
there is no idle speed screw; instead, a small hole (q) in the shutter
regulates the air flow. The idle speed is also regulated by the slow
speed mixture needle valve (t). 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 (3), a separate port (r) leads
from the fuel chamber through the carburetor adapter, through a short
hose, then directly into the engine crankcase. The fuel/air mix traveling
through this line keeps the engine running at idle. An idle speed screw
is then used to adjust the throttle shutter and fine-tune the engine
speed.
wc_gr002894
p
r
q
t
s
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