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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.
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. Yamaha continued racing throughout the 1960s and 1970s with increasing success in several formats. The decade of the 1970s was capped by the XT500 winning the first Paris-Dakar Rally in 1979. [13]
The Yamaha YZ250F is a motocross motorcycle first released in 2001 by Yamaha. It features a DOHC , four-stroke engine and initially had a steel frame and subframe in 2001–2002. In 2003 it received an aluminum subframe, which was replaced in the 2006 model with an all-aluminum frame.
Yamaha engineer Yoshiharu Nakayama first came up with the idea of creating the first competitive four-stroke race motocross bike. [6] The Yamaha YZ400F was developed to fit into this category. It solved the power dilemma by borrowing superbike technology and giving the YZ a five-valve head, liquid cooling and a 12.5-1 compression ratio.
The Yamaha YZ125 is a motocross racing motorcycle with a two-stroke 124.9 cc (7.62 cu in) displacement single-cylinder engine made by Yamaha since 1974. It is available to the public. For the first two years it was made with dual rear shocks, then changing to a monoshock. [3]
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.
The Yamaha YZR500 was a 500 cc Grand Prix racing motorcycle made by Yamaha from 1973 through 2002. It achieved significant acclaim, especially during the 1980s and 1990s. It achieved significant acclaim, especially during the 1980s and 1990s.
The Yamaha DragStar 950 (also known as the V Star 950 and the XVS950/XVS950A Midnight Star) is a cruiser motorcycle produced by Yamaha Motor Company. [1] Introduced in 2009 with a base MSRP of US$7,890, [2] the DragStar 950 has a 942 cc (57.5 cu in), fuel injected V-twin engine [3] with a 60° V angle, [2] which produces approximately 50 horsepower (37 kW) [2] [4] [5] and 58.2 pound-feet (78.9 ...