O.S. Engines .55HZ-H Hyper Ring 40L

O.S. Engine hyper Ringed helicopter engine is ideal for 3D flight-power equal to .60 size heli engines. Same mounting bolt pattern and silencer size as the OS 50SX-H Hyper. Dual needle 40L carburetor with four arm throttle lever for use with a variety of servo brands. Two year limited warranty through manufacturer beginning at the date of purchase. Requires : 10% to 30% nitro Fuel with at least 18% lubricant (Helicopter Mix). Starting equipment. Specs : Displacement: 0.55 cu in (8.93cc) Bore: 0.91" (23mm) Stroke: 0.85" (23.5mm) Practical RPM: 2,000-17,000 RPM Output: 2.1 PS, 2.07 HP Weight: 14.39oz (408g) High Speed Needle Valve: Two turns open from fully closed Idle Mixture Control Screw: Factory set-do not adjust Medium Speed Needle Valve: Two turns open from fully closed Distance/top of cylinder head-bottom of mounting tabs: 2.8" (72.6mm) Distance between mounting holes same side: 0.68" (17.5mm) Distance between mounting holes opposite side: 1.73" (44mm) Distance between muffler mounting holes: 1.4" (37...