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Although carburetor technology in automobiles reached a very high degree of sophistication and precision, from the mid-1980s it lost out on cost and flexibility to fuel injection. Simple forms of carburetor remain in widespread use in small engines such as lawn mowers and more sophisticated forms are still used in small motorcycles.
The carburetor may need to be adjusted to maintain an appropriate idle speed and air-fuel ratio, such as when moving to a higher/lower altitude or as the air filter clogs. Carburetors are adjusted either by the operator or, in some saws, automatically by an electronic control unit. [citation needed]
The Lycoming O-290 is a dual ignition, four-cylinder, air-cooled, horizontally opposed aircraft engine.It was first run in 1939, and entered production three years later. A common variant of the type is the O-290-G, a single ignition model which was designed to drive a generator as part of a ground power unit.
Boeing assembly line at Wichita, Kansas (1944). The Boeing B-29 Superfortress was an American four-engined propeller-driven heavy bomber, designed by Boeing and flown primarily by the United States during World War II and the Korean War.