OS MAX50 SX-HG Hyper.Description8.17 cc capacityHelicopter motor with long ground 8 mm Ø crankshaft, 60LH carburettor and "Hyper Head" extreme heat-sink head.SpecificationCapacity [cc]: 8.17Power approx.[kW (BHP)]: 1.40 (1.9) at 17,000 rpmRotational speed approx.[rpm]: 2,000 - 20,000Bore [mm]: 22.0Stroke[mm]: 21.5Carburettor: 60 LHShaft thread: 1/4"-28 UNFWeight approx.[g]: 406