Re: Pretty Cool Engine!
Those are for the liquid cooled Blata knock off pocketbikes, they do make good power but are on the peaky side. The genuine Blata engine these are copies of make about 15 to 16 hp.
These engines are quite a bit smaller than a typical China Doll so they can go on a smaller frame or leave you with plenty enough room to add a jack shaft and CVT or shifter conversion so you can take advantage of the power they develope at high rpm. There were some pocketbikes that had a CVT that bolted up to the engine so if the bolt spacing is right and the clutch diameter is the same, that part would be easy.