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In 1964, Honda Motor Co. introduced its first four-stroke powerhead. [19] In 1984, Yamaha introduced their first four-stroke outboards, which were only available in the low-power range. In 1990 Honda released 35 hp and 45 hp four-stroke models.
The liquid-cooled 4-stroke 4-valve 125 cc/155 cc version of the Aerox was unveiled at Sepang International Circuit in Malaysia in October 2016. [6] It is powered by a 125 cc (unrelated to the engine used in Indonesian-only Aerox 125 LC) or bored-up 155 cc Blue Core engine equipped with Variable Valve Actuation (VVA) that produces a claimed power output of 8.8 kW (11.8 hp; 12.0 PS) or 11–11.3 ...
With an undersquare bore and stroke of 100mm (3.937 in) x 118mm (4.646 in), the engine has a compression ratio of 9.5:1 and is the first Yamaha cruiser motorcycle to be equipped with the compact Exhaust Ultimate Power Valve (EXUP) four-stroke power valve system previously only found on their line of high performance sports motorcycles. [3]
The Yamaha XS Eleven motorcycle, also called XS 1100 and XS 1.1, is a Japanese standard produced from late 1977 (MY1978) to 1983, powered by an air-cooled 1,101 cc (67.2 cu in) 4-stroke, DOHC inline four-cylinder engine mounted transversely in a duplex cradle frame with swingarm rear suspension, shaft drive, and telescopic forks.
"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 XZ550 'Vision' is a 550 cc V-twin, shaft-driven sport touring motorcycle produced by Yamaha in 1982-1983. It was powered by a 4 stroke 70° liquid cooled 4 valve DOHC engine, and featured a trailing front axle and monoshock single swingarm rear. With a range of innovative technology for its class, nimble handling, and bold styling ...
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