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The bike had an 11,600 rpm redline [8] [better source needed] power and torque close to its 250 cc two-stroke rivals. [1] It benefited from engine compression braking, which allowed the engine to slow the bike down during deceleration, giving the brakes a rest. [1] The 1998 YZ400F was the first bike to come stock with a Keihin FCR carburetor.
The Yamaha DT250 was preceded by the 1968 DT-1. The DT250 began production in 1971 and was produced through 1982. Other models produced in the DT250 group were the DT250F and DT250MX. [2] The DT250 was released three years earlier than the Yamaha DT125. The DT250 was one of the leading dual-sport machines in the 1970s. [3]
Two-stroke motorcycles are a type of internal combustion engine that completes a power cycle with two strokes of the piston during only one crankshaft revolution.
The stock bike made 39 bhp (29 kW) (32 bhp (24 kW) at the back wheel) at 7500 rpm [1] – very fast for the time. A contemporary of the RD is the Kawasaki H2 750cc Triple that produced 74 hp. The 350 evolved into the more refined and cleaner running RD400C in 1976, the "D" and "E" in 77–78 and the final model, the white 1979 RD400F.
The original YZ250 of 1974 used an air-cooled 250cc two-stroke engine of 70 mm bore and a 64 mm stroke, which was improved semi-annually. The air-cooled motor was replaced in 1982 with a 249 cc liquid-cooled two-stroke reed-valved engine with a mechanical, rather than servo-driven, YPVS exhaust valve for a wider spread of power. Although other ...
Models in the DT series feature an engine displacement of 50 to 400 cc (3.1 to 24.4 cu in). The first DT model, the DT-1, was released in 1968 and quickly sold through its initial 12,000 production run. [2] [4] The DT series was created by Yamaha in the late 1960s when the United States motorcycle market was down.
Bultaco's premier model in the USA, the Pursang, was an excellent-handling and powerful 250 cc competition model that was competitive in virtually any type of speed-based off-road competition. The Pursang range was later expanded to 125, 360, and 370 cc.
The Roadking though, still retained the protuberance on the left engine cover that housed the oil pump in the Oilking. The Yezdi Roadking was based on the 1974 CZ 250 Falta, where the original bore and stroke of 70 mm × 64 mm (2.76 in × 2.52 in) was retained, but detuned for lower power than its Motocross original. The engine block is smaller ...