I don't remimber what brand scooter they were, some chinese made brand. The engine has a number 32 engraved on it. I guess it could mean alot of differant things but I am going to assume it means 32 cc. Besides it looks exactly like the one Box Car converted last year, which makes it a 32.6cc or 33cc as advertised by Duropower. I want to pull the head off of it anyway and I guess I could measure the bore and stroke. Duropower has several nice engines that would make great conversions even a couple of 4 strokes. They have a 51cc 2 stroke for $119.00, I am considering buying two of them for maybe a twin project down the road sometime.