1A301 O.S. SPEED B2102 without muffler. 1. The newly designed carburetor improves fuel mileage. Ten-minute driving per tank is not a dream for ordinary drivers any longer. 2. The new low-profile cooling head makes car gravity center much lower (-17 mm), which improves car handling drastically without sacrificing cooling performance. 3. Newly developed parts for B2102: carburetor, crankshaft, crankcase, inner head, outer head.