Has anyone ever seen this before, I have a Kohler 17hp, the walbro carb, the butterfly that is operated by the governor got sucked into the engine. I popped the head off and there it was. of course it was damaged and I need to find a new one, but there was no scoring on the cylinder wall or anything. It looks as if the screws that held it on made there way into the muffler. Oh and where can I get just a butterfly?