This is the OS 55HZ Hyper Ringed Helicopter Engine with the 40L Carburetor.

Best suited for 3D flight! Amazing power equal to 60 size engine changes the common knowledge of the 50 size helicopter engines! It can be installed in the 50 size helicopter without modification due to the same mounting bolt pattern and silencer installing size as the 50SX-H Hyper. New rear bearing is employed for improved anti-rusting, higher durability and more stable high speed running. Newly designed 40L carburetor features twin needle. A best fit new silencer will be available at the same time.		This enables to adjust hovering and high speed independently. Four armed throttle lever is employed to synchronize with servo stroke of various brand servos.
Most major internal parts are newly designed pursuing the best performance required for the 50 size helicopters.		The first helicopter muffler from O.S., PowerBoost Pipe 55 will be available at the same time. This pipe develops 100% performance of the 55HZ Hyper

FEATURES: 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 allows independent adjustment of idling,
            hovering and high speed with four arm throttle lever for use with
            a variety of servo brands
          HZ Hyper low profile black aluminum six fin cylinder head
          Two year limited warranty through manufacturer beginning at the date
            of purchase

INCLUDES: OS 55HZ Hyper Ringed Helicopter Engine with 40L Carburetor, #8 glow
            plug and instruction manual

REQUIRES: 10% to 30% nitro Fuel with at least 18% lubricant (Helicopter Mix)
          Exhaust system such as the OS PowerBoost Pipe, OSMG2880
          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
          Weight: 14.39oz (408g)
          Carburetor Settings:
            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" (37mm)
          Cylinder Head Diameter: 1.8" (47mm)
          Distance/bottom of crankcase to top of cylinder head: 3.6" (90.9mm)
          Distance from center of engine to front bearing: 2.03" (51.6mm)
          Distance from center of engine to end of Crankshaft: 3.2" (82.6mm)
          Distance from center of engine to backplate bolt: 0.98" (25mm)
          Distance from center of engine to throttle lever: 1.5" (38mm)

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