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4st 4/5/6 2011
4) Choking Passage
Choke system consists of choke valve, detent and push-pull cable. When starting cold engine, the operator should judge
whether it is necessary to operate the choke to make engine starting easier, and if necessary, to operate the handle of
choke cable manually to set it to a proper position.
When engine is cold, pull choke lever to close choke valve. When engine starts, low pressure (vacuum) area is formed in
the venturi on the back of choke valve. Then, the fuel goes through main nozzle, bypass port and pilot outlet, and sucked
into carburetor bore, where it is mixed with air that runs in from opening of the choke valve to form thick air-fuel mixture.
When engine warms up, set choke lever to home position.
a- Air intake
b- Air vent inlet
c- Main air jet
d- Pilot air jet
e- Bypass port
f- Pilot outlet
g- Throttle valve
h- Fuel inlet
i- Main jet
j- Pilot jet
k- Choke valve
l- Main nozzle
m- Air bleed
å Air
∫ Air-fuel mixture
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