Yes, a clone. Built to George at Utterpower's specifications. Has a bronze idler vis a cast iron one. I think these engins were sold a s a kit, and they were also specced to not be test ran at the factory, so the end user had a chance to disassemble and clean any casting sand from the internals before any damage was done to crank and rod bearings from a dirty test run. I have one, received as a kit and cleaned, inspected and assembled by me. I think they are a good engine, but it being "used", that price seems a little on the high side to me...