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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.
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 ...
Yamaha brought the XSR900 to market in 2016, releasing it in two variants worldwide. The first, a variant uses a yellow and black paint scheme with a gold-colored inverted fork. This paint scheme is a 60th Anniversary Edition first used on other Yamaha models in 2015, such as the YZF-R1 , to commemorate Yamaha's 60 years of racing heritage ...
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 ...
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