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This 47cc ATV, dirt bike, & pocket bike engine with gearbox transmission is also an excellent replacement on a pocket bike, small go-kart or other garage-built recreational motorsports project. It sports a 3 to 1 chain reducer making it very adaptable to many applications. This is a very common engine & transmission combination that is used on a huge number of Chine-made recreational vehicles. This 2-stroke 47cc ATV & dirt bike engine is used quite frequently on custom projects and applications. Please ensure this engine will provide the form, fit, and function needed on your custom scooter, go-kart, gas powered bicycle, or other personal transportation vehicle prior to ordering. The 2 stroke oil mix gas ratio is 25:1 or 30:1 on this 47cc engine. Includes an 11 tooth 8 mm chain drive sprocket.