My first guess is that there is a fuel shutoff solenoid that is remaining energized. If you have such a device, it would be located on the carburetor. To check, it should have voltage to it when the key is on and not when the key is off.
My second guess is the kill circuit. When you turn the key to the off position, it should ground the kill wire coming from the ignition module or magneto. If you have a small wire coming out of the ignition assembly, that should be the kill wire. Grounding it should stop the engine.
Those are my educated guesses. I have no experience specific to the model you are working onso I can't tell you "chapter and verse" how it should be wired or how it was originally wired. Only offer generic advice frompast experience.
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