This is the O.S. Engines GF30 4-Stroke Gasoline Engine. FEATURES Ideal for models designed for 1.20-1.50 glow engines or 20cc gasoline engines Same firewall mounting system as the O.S. GT22 Rear mounted O.S. designed carb with PD-08 fuel pump Lightweight IG-07 igniton module accepts up to 2S LiPo power Positive Crankcase Ventilation (PCV) helps keep model and environment cleaner by eliminating blow-by gas and oil waste Two year limited warranty through Hobby Services beginning at date of purchase INCLUDES GF30 4-Stroke Gasoline Engine, Spark Plug, Muffler, Ignition Module and Instructions REQUIREMENTS 2-cycle oil, see SPECS Ignition Battery: 4.8-6.0V NiCd or NiMH, 6.6V LiFe or 7.4V LiPo pack LiPo battery requires voltage regulator Propeller: 16x10-12, 17x8-10, 18x6W-8 Mounting standoffs, length depends on aircraft Gasoline safe fuel tubing and fuel filter SPECIFICATIONS Carburetor Adjustments; Needle Valve: Slowly open throttle fully after engine is started. Close needle valve in 30-45° increments. When RPMs start to decrease, close needle valve 60-90° further. Open slowly at 15° per second until maximum RPM is obtained, then open 60-90° further from max RPM point. Specs: * Displacement: 1.827 cu in (29.94 cc). * Bore: 1.496" (38mm). * Stroke: 1.039" (26.4mm). * Practical RPM Range: 1,800-9,000. * Output: 2.8s/2.76hp @ 9000RPM. * Weight: Engine, 34.9oz (990g). * Muffler, 4.0oz (113g). * Ignition Module, 3.35oz (95g). * Gasoline/Oil Mixture: 30:1 - 50:1. * 25:1 fuel/oil mixture if brand of oil states 50:1 mix. * Crankshaft Size: UNF5/16-24.