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  2. Critical engine - Wikipedia

    en.wikipedia.org/wiki/Critical_engine

    The critical engine of a multi-engine fixed-wing aircraft is the engine that, in the event of failure, would most adversely affect the performance or handling abilities of an aircraft. On propeller aircraft, there is a difference in the remaining yawing moments after failure of the left or the right (outboard) engine when all propellers rotate ...

  3. Yamaha XT250 - Wikipedia

    en.wikipedia.org/wiki/Yamaha_XT250

    The XT250 is branded the SEROW 250 in Japan. In 2013, the USA XT250 received a fuel-injected engine. In January 2020, Yamaha Japan released the Serow Final Model, discontinuing the little bike due to increasing emission requirements. This is its final year. [5] Yamaha US has continued the model unchanged. (For the origin of the name, see serow.)

  4. Yamaha XTZ 250 - Wikipedia

    en.wikipedia.org/wiki/Yamaha_XTZ_250

    White 2011 XTZ 250 Tenere. The Yamaha XTZ 250 is a dual-sport motorcycle designed and produced by Yamaha Motor do Brasil, starting in 2006.It is a variant of the XT250, which is marketed worldwide, and derives from the 1975 XT500 model, which established a successful range of dual-sport motorcycles, including the XT600 Ténéré, that greatly contributed to Yamaha's image.

  5. Yamaha Genesis engine - Wikipedia

    en.wikipedia.org/wiki/Yamaha_Genesis_engine

    "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 ...

  6. Two-stroke power valve system - Wikipedia

    en.wikipedia.org/wiki/Two-stroke_power_valve_system

    A stroke is the action of a piston travelling the full length of its cylinder.In a two-stroke engine, one of the two strokes combines primarily the intake stroke and the combustion stroke, while the other stroke primarily combines the compression stroke and the exhaust stroke, though technically since both ports are exposed during both the combustion and compression strokes, some reversion ...

  7. Yamaha XT225 - Wikipedia

    en.wikipedia.org/wiki/Yamaha_XT225

    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]