I thought I already had a thread going about this but I can't find it so it must have been my other broken bolt problem (got it out!).
I was putting the finishing touches on a new-to-me NU50... new pipe, belt, DR kit. When I was tightening the head bolts one of them broke. I tried left handed drill bits, easy-outs, etc. When I started I was dumb and didn't remove the engine from the frame and because of this my hole was not in the center. Now that I have the engine on the bench I have drilled out almost all of the bolt (except one side) and I realized that this hole was previously drilled out and I believe a helicoil was used. So now I am not sure what my options are. If I am even able to get the rest of the bolt and the helicoil out, will I be able to use a helicoil kit again? I have never re-tapped (but have a set) and never installed a helicoil. I called a small engine shop and they said they "could try", not leaving me feeling very sure.
I would love to hear your ideas, successes, failures, etc. If someone in Kansas City could help me get this fixed up I got all the free beer and pinball you can stand.