The 120AX Special has the same mounting dimensions as the original, but delivers nearly 10% more power. For starters, the crankshaft port timing has been modified to increase power at high rpm. The velocity stack on the carb adds acceleration at high rpm while a 0.1 mm head gasket increases compression ratio for more power. Pair the 120AX Special with an O.S. E-5020 muffler! Check out the difference in rpm using an APC 15x10 propeller: 120AX Special: 9,532 Standard 120AX: 9,260 Specifications: Displacement: 1.218 cu in (19.96 cc) Bore: 1.197 in (30.4 mm) Stroke: 1.083 in (27.5 mm) Practical RPM range: 1,800-9,500 Output: 3.2 PS (3.155 HP) @ 9,500 rpm The O.S. 120AX Special will be available early May. OSMG0652 120AX Special Ringed Engine Retail: $499.99 Street: $329.99 Please visit our website osengines.com to see all the fine products in the O.S. line.
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