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The Yamaha SR400 (1978–2021) and SR500 (1978–1999) are single-cylinder, air-cooled, two-passenger motorcycles manufactured in Japan by Yamaha Motor Company as a street version of the Yamaha XT500, with a standard riding posture and styling recalling the Universal Japanese Motorcycles of the 1970s.
"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 ...
Yamaha-built DOHC V6 Ford Taurus SHO engine. Yamaha has built engines for other manufacturers' vehicles beginning with the development and production of the Toyota 2000GT (1967). The cylinder head from the Toyota 4A-GE engine was developed by Yamaha and built at Toyota's Shimayama plant alongside the 4A and 2A engines. [28]
The MT-09 is the first Yamaha motorcycle since the XS750 and XS850 to be powered by inline-three engines. Both are shaft-driven motorcycles produced from 1976 to 1981. In 2017, the MT-09 was updated with fully adjustable suspension, traction control, antilock brakes, slipper clutch, LED headlights, and updated styling. [2] In October 2020, the ...
Yamaha YZR500. The RD500LC (Race Developed 500CC Liquid Cooled motorcycle) uses a 50-degree, twin-crankshaft V4 engine layout.Linked Yamaha YPVS exhaust power valves are controlled by a single electronic unit and servo motor and are designed to give a broader power band.
Yamaha claimed this was the world's first mass-produced four-valve motorcycle engine. [3] The TX500 was also claimed to be the first motorcycle to use an integrated circuit-based voltage regulator. [8] The air/fuel mixture was delivered by two 32 mm Keihin constant-velocity (CV) carburetors in early models and by 38 mm Mikunis beginning in 1976.
Motorcycles with a V-twin engine mounted with its crankshaft mounted in line with the frame, e.g. the Honda CX series, are said to have "transverse" engines, [1] [2] while motorcycles with a V-twin mounted with its crankshaft mounted perpendicular to the frame, e.g. most Harley-Davidsons, are said to have "longitudinal" engines.
2000 Yamaha Royal Star Tour Classic. The drive package on the Royal Star includes a liquid-cooled 1,294 cc (79.0 cu in) V4 engine. It has four valves per cylinder, overhead camshafts, and shim-over bucket valves. The five-speed overdrive transmission is part of the engine case and both the engine and transmission share oil.