Ultra Sport .40 with an OS 40SF going full throttle, inverted, four feet off the hard packed dirt runway, and I pulled back.

Looked like Bugs Bunny went down the runway from the trench it dug.

Engine was cracked from the bearing housing all the way to the back of the crankcase.

Sheared the head right off.

But the carb stayed intact.

High temp JB welded the case back together, put on another head, and the engine worked, until the JB weld flaked off. Doesn't take the vibration too well.

But I was able to use it again for a little while.