This is the DLE 55-RA Gasoline Engine with Electronic Ignition. FEATURES: High performance in a compact package Rear exhaust for the perfect tuned pipe setup Pitts style aluminum muffler Newly designed piston with re-engineered skirt for less piston weight resulting in such advantages as awesome throttle response, more power and longer engine life Electronic ignition is the no-hassle answer to simpler starts, higher performance and minimal RF noise Producing 100 more rpm than the DLE50, the DLE 55-RA comes with engine standoffs, electronic ignition, spark plug and muffler Two year limited warranty through Hobby Services beginning at date of purchase INCLUDES: DLE 55-RA Gasoline Engine Electronic Ignition Pitts Muffler NGK CM6 Spark Plug Four Engine Standoffs with Mounting Hardware Integrated Choke Rod Guide Rear-mounted Carb Instruction Manual REQUIRES: Gasoline with at least 87 octane rating 2-cycle oil, mix ratio for this engine is 30 parts gas to one part oil and must be followed exactly for warranty consideration and optimum performance 4.8 - 12V battery for ignition (separate receiver style pack can be used) (LiPo & LiFe requires voltage regulator) Propeller and field equipment SPECS: Displacement: 55.6 cc (3.39 cu in) Bore: 1.76 in (45 mm) Stroke: 1.37" (35mm) Compression Ratio: 7.6:1 Static Thrust: 14.5kg Pulling Force/100 meters altitude 12.8kg Pulling Force/1,800 meters altitude Gasoline/Oil Mixture: 30:1 Gasoline Octane Rating: 87 Recommended Propellers: 22x8, 22x10, 23x8, 23x10 Weight, engine: 3.74 lb (1.33kg) Weight, muffler: 3.17 oz (90 g) Weight, ignition module: 5.11 oz (145 g) Output: 5.5 hp @ 8,500 RPM Carburetor Adjustments; Low Speed Needle: 1.5 turns out as a starting point, adjust for a smooth idle and a reliable transition to high throttle High Speed Needle: 1.5 turns out from closed, adjust needle to peak RPM, if engine slows or dies at full throttle, the high-speed mixture is likely too lean Muffler Dimensions: 3.8 x 2.6 x 1.2" (97 x 66 x 31mm) Muffler Exhaust Outlet Diameter: 0.79" (20mm) Muffler Exhaust Outlet Length: 0.79" (20mm) Distance Between Mounting Hole Centers Same Side: 2.6" (67mm) Distance Between Mounting Hole Centers Opposite Side: 3.5" (90mm) Height from bottom/Crankcase to top of Cylinder Head: 5.9" (150mm) Width of Cylinder Head: 3.1" (80mm) Distance Between Muffler Mounting Hole Centers: 1.7" (43mm) Crankshaft Thread: 5mm/.8 pitch course thread COMMENTS: To avoid permanent damage to the electronic ignition system, NEVER turn your DLE engine over with the system switched on and the plug not installed. 7/11/12 pjw jxs 09/24/12 ir/jxs