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S421BX Off Road .21 Engine Maximum power - 2.75 hp R.P.M. (M.P.) 34.500 rpm Bore x Stroke - 16.26 mm x 16.80 mm Ports - 8 Piston type - Die-cast Crankshaft ? 14 mm Crankshaft Type - SG Glow Plug Type - Turbo Exhaust Type Rear Carburetor: 8 mm (interchangeable insert) Type - Slide Material - Nylon Adjustement - Single Fuel Type - Recommended 25% nitro S421BX Off Road .21 Engine Maximum power - 2.75 hp R.P.M. (M.P.) 34.500 rpm Bore x Stroke - 16.26 mm x 16.80 mm Ports - 8 Piston type - Die-cast Crankshaft ? 14 mm Crankshaft Type - SG Glow Plug Type - Turbo Exhaust Type Rear Carburetor: 8 mm (interchangeable insert) Type - Slide Material - Nylon Adjustement - Single Fuel Type - Recommended 25% nitro