OS .55HZ-R DRS Ring 40L-R

This is the Limited Edition OS 55HZ-R DRS Ringed Helicopter Engine with the DRS (Demand Regulator System). FEATURES: DRS system delivers fuel to the regulator under constant pressure for precise fuel delivery throughout the entire tank from full to empty Mounting position of DRS is perfectly in line with the carb for consistent operation in all attitudes of flight Same mounting bolt pattern as the OS 50SX-H Hyper Dual needle 40L-R 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 six fin cylinder head Two year limited warranty through Hobby Services beginning at the date of purchase INCLUDES: OS 55HZ-R DRS Ringed Helicopter Engine, #8 Glow Plug, Check Valve and Instruction Manual REQUIRES: 10% to 30% nitro Fuel with at least 18% lubricant (Helicopter Mix) Fuel filter and starting equipment SPECS: Engine; Displacement: 0.55 cu in (8.93cc) Bore: 0.91" (23mm) Stroke: 0.85" (23.5mm) Practical RPM: 2,000-20,000 RPM Output: 2.1 PS, 2.07 HP Weight: 15.1oz (429g) Carburetor Settings: High Speed Needle Valve, Approximately two turns open from fully closed position Idle Mixture Control Screw, Factory set at center, turn right to richen or left to lean mixture Medium Speed Needle Valve, One turn open from fully closed, adjust only after setting high speed needle and idle mixture screw, do not turn more than 90 right or left 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)