OS Max OSM15630

This is the OS 55HZ Hyper Ringed Helicopter Engine with the 40L Carburetor. 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 OS 55HZ Hyper Ringed Helicopter Engine with 40L Carburetor, #8 glow plug and instruction manual 10% to 30% nitro Fuel with at least 18% lubricant (Helicopter Mix) Exhaust system such as the OS PowerBoost Pipe, OSMG2880 Starting equipment 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) jxs 9/01/09 ir/jxs