RE5 was the first (and only) Japanese motorcycle produced with a Wankel rotary engine. That, and its Giugiaro styling, make it one of the oddest and most collectible motorcycles of the 1970s.[114][115] The 1974 RE5 is one of the JSAE 240 Landmarks of Japanese Automotive Technology,[116] and a 1976 model is in the AMA Motorcycle Hall of Fame.[117] Burgman Fuel-Cell Scooter uses electric-motor propulsion, powered by an air-cooled hydrogen fuel cell; its only emission is water.