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"Cutaway of Yamaha Genesis inline-four 20-valve engine" The DOHC Genesis engine has five valves per cylinder and downdraft carburetors. Yamaha adopted the 5-valve concept, using three intake valves and two exhaust valves per cylinder, because it allowed both excellent volumetric efficiency and high RPM. As designers began to appreciate the ...
The Yamaha XT225, or known in some markets as the Yamaha Serow (from the Japanese serow), was a dual-sport motorcycle produced by Yamaha from 1986 to 2007. The XT225 was preceded and superseded by the XT250. Power is supplied by a 223cc single-cylinder, air-cooled four-stroke engine featuring a SOHC and 2 valves. [1]
Yamaha entered the ATC market in 1980, after paying patent-right to Honda to produce their own version of the All Terrain Cycle. Starting modestly with a 125cc recreational ATC that would remain the foundation of their line through 1985, the YT125 featured a 2 stoke engine with sealed airbox with snorkel intake, an autolube oil injection system, and featured a narrow tunnel above the engine ...
The Yamaha Blaster is a compact all-terrain vehicle produced as an entry-level machine manufactured in Japan and sold in the United States from 1988 to 2006. Because of the Blaster's initial low price tag, it sold in large numbers for many years from its inception in 1988 all the way to present day.
The Yamaha V-Max, (or VMAX) is a cruiser motorcycle produced by Yamaha from 1985 through 2020. Known for its 70° V4 engine , shaft drive, and distinctive styling, the V-Max was discontinued following the 2020 model year.
In 1996, the AMA changed racing rules to allow 450 cc four strokes to compete in the same racing class as 250 cc two-strokes. [5] 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.
The 1970 model was designated the XS-1. [4] Subsequent Yamaha XS650 models [5] were XS-1B (1971), XS-2 (1972), then TX650/XS2B (1973), TX650-A (1974), XS650B (1975), XS650C (1976), XS-D (1977), XS-E (1978), XS-F (1979). 1979 was the last year of the so-called "Standards" (an unofficial term commonly used to differentiate it from the "Special," which has pullback bars, a teardrop tank, and ...
In 1967 a new larger displacement model was added to the range, the 350cc two stroke twin R-1. In 1968, Yamaha launched their first four-stroke motorcycle, the XS-1/650 which was a 650cc four-stroke twin, a larger and more powerful machine that equaled the displacement and performance of the popular British bikes of the era, such as the Triumph ...