Roto starter for 20-80cc engine, the starter can used for DLE engines, DLA engines, DA engines.40-400calss starter can be used for rc Helicopter and Nitro engine aircraft. Made of 110CC four-stroke motorcycle starter motor, extremely durable.Structural parts are made of carbon fiber board cutting to achieve the best in weight and strength, very light. Wire length: 1.6m Weight: about 1.45kg Start method: multiplePower supply: 12V-18V (advice lead-acid battery ,3S/ 3000MAH or above /20c or above lithium battery)Working current: 30ARPM at no load: 1000RPM/HMax. Torque: 120KG/CMFit : 20CC-80CC gasoline airplane, 2080CC engines40-400class Nitro engine Except the metal cone and rubber cap are different, everything else is the same for15-80cc and 40-400class starters. Big cap is used for RC gas aircraft, small cap is used for RC helicopter.Manual measurement may have 2-3 mm tolerances, reference only !Package includes:1pc Starter(The type you choose)