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Variable jet - SU type Piston chamber Piston Throttle Main jet Jet needle Choke adjustment to jet Fuel pipe to jet Float chamber Float Float needle Fuel feed pipe stub
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The SU is the simplest type of variable jet carburettor, the other main type, the Stromberg, has a rubber diaphragm instead of a piston.

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How variable-jet carburettors work

Variable jet carburettor - SU type The SU is the simplest type of variable-jet carburettor, the ...

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