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Hi William
The bi-metal "element" (looks like a spring) inside the round black choke cover is a fairly common service item. It is supposed to wind & unwind as it warms-up or cools down. With age & heat cycles it tends to wind & unwind less.
Pull the air cleaner lid so you can see the position of the choke butterfly. At room temperature, after you stomp the throttle pedal once, the butterfly should close. If the bi-metal element is "bad" the butterfly won't close enough.
-G