The Continental C90 and O-200 are a family of air-cooled, horizontally opposed, four-cylinder, direct-drive aircraft engines of 201 in³ (3.29 L) displacement, producing between 90 and 100 horsepower (67 and 75 kW). Built by Continental Motors these engines are used in many light aircraft designs of the United States, including the early Piper PA-18 Super Cub, the Champion 7EC, the Alon Aircoupe, and the Cessna 150. Though the C90 was superseded by the O-200, and many of the designs utilizing the O-200 had gone out of production by 1980, with the 2004 publication of the United States Federal Aviation Administration light-sport aircraft regulations came a resurgence in demand for the O-200. Design and development The C90 was introduced in 1947 as a follow-on to the A65, which had been in production since 1939. Many of the designs powered by the C90 are upgraded variants of earlier A65 powered designs, such as the Piper J-3 Cub and PA-11 Cub Special, Aeronca 7AC, and Luscombe 8A. The engine was developed from the earlier O-190 by increasing the stroke inch. This engine family is considered to be dependable, according to both industry publications and the FAA. In a cooperative venture, Rolls-Royce produced these same designs in England, under separate certification, with model designations beginning RR, e.g. the Rolls-Royce RR C90-12FH is the equivalent of the Continental C90-12FH; the Rolls-Royce versions are "directly interchangeable with the equivalent models manufactured by Continental." The Rolls-Royce O-200-A powers the Beagle Pup Series 1, the Rollason Condor, the Bölkow Bo 208 C Junior, the Avions Robin DR 220, the Morane-Saulnier MS-880, plus the Victa Airtourer 100 and the Reims F150 (a version of the Cessna 150 license-built in France by Reims Aviation). All versions of the C90 and O-200 are four-stroke reciprocating engines and are all similar in size, displacement and weight. These engines are typically fitted with an updraft carburetor, though the C90-8FJ, -12FJ, and -14FJ are equipped with fuel injection systems. They utilize a redundant ignition system requiring no external power, driving two magnetos, each of which fires one spark plug per cylinder. Each cylinder has one intake valve and one exhaust valve, pushrod-activated. Continental's recommended time between overhaul (TBO) for these engines is 1,800 hours of operation or 12 years in service, whichever is reached first. The standard certification for the C90 and O-200 specifies Avgas 80/87 as the minimum fuel grade. Both are eligible