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Thanks Jerry. It was burning lot's of oil through the exhaust when it locked up. I was guessing that we scored the cylinder walls and piston finally welded itself to the walls, and that is what bent the rod. There isn't any play in the rod bearing. Is there any other way to test those needle bearings before getting too far?

Good Idea Brian. These engines are a Chinese copy of a Honda original. A zillion of them are made, but the factory that made our toy had a version with a slightly different crank that I cannot find. The factory burned to the ground, and they did not rebuild. I've actually got a new crank that I can rob a rod off of. I tried a car machine shop, didn't think about a cycle shop. I'll give it try.