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CARBURETOR:
A. Construction and Operation:
The Bridgestone rotary valve models are equipped with Amal-type carburetors, i.e. those which control both
the fuel and air flow. The air passing through the air cleaner enters the carburetor venturi. The vacuum
created in the venturi by this flow of air causes the fuel in the float chamber to be drawn through the main
jet, needle jet and then through the passage to the fuel inlet port. This fuel is mixed with air entering
through the venturi. The fuel has been atomized by the air entering through the air jet. Carburetors are
classified according to the size of the venturi. The 50, 60 Sport models and the 90cc series (except the 90
Sport) utilize the 15mm carburetor. The 90 Sport and the 175 DT are equipped with 17mm carburetors.
Because two carburetors supply a mixture of fuel and air to the 175 DT engine, it is important that both
carburetors are synchronized so that equal performance is obtained.
Different parts of the carburetor control the fuel/air mixture for starting and for low speeds, medium and
high speeds. Instructions for each follow:
(1) Starter System
When the carburetor starter lever on the handlebar is pushed, the starter plunger is raised by the starter
wire.
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