Hey guys, I’ve got an older sportsman 400 2 stroke that’s giving me some fits. Sometimes, generally on an older spark plug, I can’t get it to shut down. Turn the key off or hit the kill switch and it just stumbles a bit but keeps running. It’s done this for as long as I’ve had it. Just recently rebuilt the top end, new key switch, swapped exhaust for a low hour used system, and new reeds. I’m at a loss as to what could be causing this.

Anyone have any ideas?

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