I had hobby services do the repair. They are replacing the piston and liner as well. The fit was loose. According to them. Its a fine deal. I guess considering what the parts cost. I spoke will Bill. He said there was actual flakes of rust. Hardly seems possible. Best I know how, the engine was cared for perfectly. He recommends castor as the best lube. Probably because I wasn't using it. Wish they would cover it under warranty. It still doesn't seem right.