ORIGINAL: MinnFlyer

Actually, metal castings can be very brittle. I have knocked cooling fins off on more than one occaision [:@]

Yes, found out the hard way. The story is I had a stubborn bolt that would not come out very easily from the mounting hole at the angle it needed to pass the crankcase housing, and it pressed against the muffler housing as I was twisting it out (it was very stubborn) and the chunk appeared. Goodness was I [:@][:@][:@]

The area that is damaged is not a good one, and it won't be covered under warranty - that's the bad news

DAMN

The good news is, before you dish out any cash for a new case or engine, try JB weld.

OK, will try that. Others have suggested it above also

My dad has an OS91 on which he stripped the muffler threads in the head. He used JB Weld and that engine has been running for years like that.

Although that is not a break it still is encouraging to hear.

The combination of JB Weld AND the fact that the muffler will help to hold it on, I'm willing to bet that it will work just fine.

Worth a shot anyways

I know that if I did it, that's the first thing I would try

Thank you so much