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Once the ignition is turned on and the cold engine starts, the choke butterfly is closed (cold condition) creating more vacuum and adding more fuel. As power is sent to the choke cap, the bi-metal spring begins to heat up as the motor is running. Once the spring heats up, the spring should begin to wind itself, turning the choke cap. As the choke cap turns, it pulls the choke lever open, allowing additional air, which allows the carburetor to do its job.