4-8 FUEL AND LUBRICATION SYSTEM
STARTER SYSTEM
When the starter plunger 1 is lifted, the fuel metered by the starter jet 2 is mixed with the air coming from
the float chamber 3. The mixture, rich in fuel content, reaches plunger area and mixes again with air com-
ing from the starter air passage 4.
The two successive mixings of fuel with air are such that a proper fuel/air mixture for starting is produced
when the mixture is sprayed out through the starter outlet 5 into the main bore.
FLOAT SYSTEM
The floats 1 and needle valve 2 are associated with the same
mechanism, so that, as the floats move up and down, the needle
valve 2 too moves likewise. When the fuel level is up in the float
chamber 3, the floats 1 are up and the needle valve 2
remains pushed up against valve seat. Under this condition, no
fuel enters the float chamber(.As the fuel level falls, the floats 1
go down and the needle valve unseats itself to admit fuel into
the chamber 3. In this manner, the needle valve 2 admits and
shuts off fuel alternately to maintain a practically constant fuel
level inside the float chamber 3.
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