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  2. Yamaha Fino - Wikipedia

    en.wikipedia.org/wiki/Yamaha_Fino

    The Yamaha Fino 115 is a scooter introduced by Yamaha Motor Company Thailand in 2007. The Fino 115 has a relatively low seat height, making it popular among smaller riders, as well as an air-cooled 115 cc single-cylinder 4-stroke SOHC engine. [1] Little has changed about the Fino 115 since its introduction with the exception of color choices.

  3. Outboard motor - Wikipedia

    en.wikipedia.org/wiki/Outboard_motor

    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. They continued to lead in the development of four-stroke engines throughout the 1990s as US and European exhaust emissions regulations such as CARB ( California Air Resources ...

  4. 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 ...

  5. Yamaha Mio - Wikipedia

    en.wikipedia.org/wiki/Yamaha_Mio

    Engine: 113.7 cc (115), 4-stroke, SOHC, 2 valve, air cooled (124.8 cc (125), ... The Yamaha Mio is a scooter with a CVT transmission made by Yamaha Motor.

  6. Four-stroke engine - Wikipedia

    en.wikipedia.org/wiki/Four-stroke_engine

    Four-stroke cycle used in gasoline/petrol engines: intake (1), compression (2), power (3), and exhaust (4). The right blue side is the intake port and the left brown side is the exhaust port. The cylinder wall is a thin sleeve surrounding the piston head which creates a space for the combustion of fuel and the genesis of mechanical energy.

  7. Four-stroking - Wikipedia

    en.wikipedia.org/wiki/Four-stroking

    Four-stroking is a condition of two-stroke engines where combustion occurs every four strokes or more, rather than every two. Though normal in some instances at idle, extremely high engine speeds, and when letting off the throttle, such firing is uneven, noisy and may, in cases of malfunction, damage the engine if allowed to continue unabated.

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