Mini bike engine runs full throttle, I believe there's a problem with the internal governor gear, any thoughts?

It's a Honda g150 engine that's been sitting in a shed for over 35 years. I took off the carb and cleaned it out, the governor arm doesn't return back to idle, it just sits on full throttle. Runs fine minus that problem. Got it started yesterday and it took off I had to bail and it kept going right into my neighbors house lol.Mini bike engine runs full throttle, I believe there s a problem with the internal governor gear, any thoughts

The throttle control is that grip on the right handle bar. You should be able to turn it to move the throttle what you refer to as the governor arm goes to a fin that gets moved by air generated by the fins on the flywheel, it needs to be freed up that's all. Take the cover off that holds the pull start you'll see it. There's also a spring that should be on it.

Maybe a spring or something is missing/

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