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• Topics about BRAKES
• Topics about CARBURETOR
• Topics about STARTING ...
• Topics about CHARGING ...
• Topics about TRANSMISSION
• Topics about ELECTRICA...
• Topics about TIMING/VA...
• Topics about FUEL SYSTEM
• Topics about COOLING S...
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An automatic choke closes against spring pressure. During engine crank, it then exposes almost full
manifold vacuum to the carburetor venturi, drawing a large amount of fuel through the main metering system. ... The choke plate and fast-idle cam are attached to the spring via the carburetor's throttle linkage.
The automatic choke is the main component that regulates the air/fuel mixture while the engine is being cranked. As the engine warms up, the automatic choke adjusts to the temperature change to regulate the fuel/air mixture to the proper ratio.