Just picked up a 1948 Schwinn (American Flyer)has a Whizzer I think. Bike is complete with all the heavy duty parts that Schwinn used for a motorized bike. After a days research I think its a Whizzer engine, has a Tittolson carb, aluminum head, iron cylinder and 2 cables with steel levers one going to the carb and the other to the engine. Engine numbers are H-55829 and 2204 W4. Can send pics. if that would help. Any help would be greatly appreciated. Thanks, Grant