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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 benefits of multi-valve layout, 4-valves-per-cylinder (and even 3-valves) became common.
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.
The under-seat area is occupied by the upper cylinder exhaust chambers, the oil pump and one-way valves, the battery and the YPVS (Yamaha Power Valve System) servo motor. The battery is of the 'wet' lead acid type and a cut-out is provided in the right side panel to view the acid levels without having to dismantle half the bike!
YDS-3 (1964) 246 cc, two-stroke, parallel-twin, it used the world's first oil injection lubrication system in a 2-stroke engine. [2] DT-1 (1968) Yamaha's first true off-road motorcycle. [1] XS-1 (1970) Yamaha's first four-stroke engine motorcycle (650 cc twin). [3] YZ Monocross (1975) First production motocross bike with a single rear shock. [3 ...
Yamaha XS 850. The 826cc replacement for the XS750 was a very similar beast. The engine received bigger barrels and pistons, a beefier crankshaft, a wider primary chain and better oil ways. The addition of an oil cooler helped keep things cool. The European 850 “G” came with the 24 liter tank as standard, plus a huge 8" diameter headlight.
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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 ...
Jackie Chan drove Yamaha V-MAX in the movie Gorgeous. In the movie Mechanical Violator Hakaider, his motorcycle (called Guilty in merchandising) is a Yamaha V-MAX, that when he transforms gets its chains removed. In the video game Final Fantasy VII (1997), the protagonist Cloud Strife's Hardy Daytona motorbike is based on the Yamaha V-Max. [10]