O.S.Max HZ Series O.S.Max .55HZ Hyper Type 2-Stroke, Ringed Helicopter Displacement .55 cu in (8.93cc) Bore .91" (23mm) Stroke .85" (21.5mm) RPM Range 2,000-20,000 Output (HP/rpm) 2.1/17,000 Weight (engine only) 14.4 oz. (410g) Crankshaft Thread 1/4"-28 Propeller Range - Included Decal Sheet, Cooling Head Instructions, #8 Glow Plug 40L Carburetor

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2 Years Limited Warranty