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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.
The first bike manufactured by Yamaha was actually a copy of the German DKW RT 125; it had an air-cooled, two-stroke, single cylinder 125 cc engine [1] YC-1 (1956) was the second bike manufactured by Yamaha; it was a 175 cc single cylinder two-stroke. [1] YD-1 (1957) Yamaha began production of its first 250 cc, two-stroke twin, the YD1. [1]
Yamaha was an early innovator in dirt-bike technology, and introduced the first single-shock rear suspension, the trademarked "Monoshock" of 1973. [12] It appeared in production on the 1974 Yamaha YZ-250, a model which is still in production, making it Yamaha's longest continuous model and name.
The Yamaha YZ450F is a four-stroke racing motocross bike built by Yamaha Motor Corporation. It was the successor to the previous YZ426F which was discontinued in 2003. It is credited by Cycle World and Dirt Rider magazines as the bike that started the four-stroke dirt bike revolution.
The Yamaha XT250 is a motorcycle made by Yamaha Motor Company. Yamaha XT250 model year 2008. An offroad motorcycle rider passes through a creek and up a muddy hill.
The 2024 AMA Supercross Championship was the 51st season of off-road stadium motorcycle racing in the United States. Comprising 17 rounds, the series ran from January until May, crowning supercross champions in both the 250cc and 450cc classes, concluding with the Salt Lake City round on May 11. [ 1 ]
The Yamaha YZ450FX is an off-road performance motorcycle made by Yamaha Motor Company.It currently has a 450 cc (27 cu in) liquid-cooled single-cylinder engine. First offered in 2016 at 450cc, it shared many components and design concepts with both the Yamaha WR450F and Yamaha YZ450F motocross model.
In late 1975, Yamaha, having lost veterans to other teams, offered Hannah a contract. Hannah took the unsigned $1,000-a-month offer to Suzuki hoping that they would match it. [5] [8] Suzuki declined and Yamaha, in December 1975, announced that the virtually unknown Hannah would be joining the team for the 1976 season. [8] [11]