Airplane engine compatible with the OS Engines 46AXII series.Features include: benchmark propeller size of 10x6 for break-in; bore of 0.866 inch (22 mm); 2-needle carburetor; UNF 5/16-24 threaded crankshaft; advanced bi-metallic liner cylinder; single-cylinder configuration; displacement of 0.455 cubic inch (7.45 cc); engine weight of 13.3 oz (378 g) without accessories; output of 1.65 PS at 16, 000 RPM; height of 3.3 inches (85.2 mm) from crankcase bottom to of cylinder head; length of 4.4 inches (111.7 mm) from backplate to end of crankshaft; 2-piece aluminum construction; accessory weight of 3.81 oz (108 g); requires fuel with at least 16% synthetic lubricant; compatible with A3 plug; recommended propeller range of 10.5x6 to 12x6–7; operational RPM range of 2, 000 to 17, 000; recommended fuel nitromethane content of 5% to 20%; stroke of 0.772 inch (19.6 mm); 2-stroke engine type; width of 2 inches (50.8 mm) including mounting tabs.