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  2. Yamaha YZ250F - Wikipedia

    en.wikipedia.org/wiki/Yamaha_YZ250F

    The Yamaha YZ250F is a motocross motorcycle first released in 2001 by Yamaha. It features a DOHC , four-stroke engine and initially had a steel frame and subframe in 2001–2002. In 2003 it received an aluminum subframe, which was replaced in the 2006 model with an all-aluminum frame.

  3. Four-stroke engine - Wikipedia

    en.wikipedia.org/wiki/Four-stroke_engine

    A four-stroke (also four-cycle) engine is an internal combustion (IC) engine in which the piston completes four separate strokes while turning the crankshaft. A stroke refers to the full travel of the piston along the cylinder, in either direction. The four separate strokes are termed: Intake: Also known as induction or suction. This stroke of ...

  4. Starter (engine) - Wikipedia

    en.wikipedia.org/wiki/Starter_(engine)

    An automobile starter motor (larger cylinder). The smaller object on top is a starter solenoid which controls power to the starter motor and engages the Bendix drive.. A starter (also self-starter, cranking motor, or starter motor) is a device used to rotate (crank) an internal-combustion engine so as to initiate the engine's operation under its own power.

  5. List of Yamaha motorcycles - Wikipedia

    en.wikipedia.org/wiki/List_of_Yamaha_motorcycles

    The first bike manufactured by Yamaha was actually a copy of the German DKW RT 125; it had an air-cooled, two-stroke, single cylinder 125 cc engine [1] YC-1 (1956) was the second bike manufactured by Yamaha; it was a 175 cc single cylinder two-stroke. [1] YD-1 (1957) Yamaha began production of its first 250 cc, two-stroke twin, the YD1. [1]

  6. Slider-crank linkage - Wikipedia

    en.wikipedia.org/wiki/Slider-crank_linkage

    This balanced motion implies other ideas as well. Assuming the crank arm is driven at a constant velocity, the time it takes to perform a forward stroke is equal to the time it takes to act a reverse stroke. The crank moves in only one direction, provided the position and condition of the slider are not externally altered.

  7. Suzuki LT250R - Wikipedia

    en.wikipedia.org/wiki/Suzuki_LT250R

    The '87+ rear axle carrier includes forward-reverse slide chain tensioning rather than the 85-86's rotary tensioning method. The '87+ carrier housing slides forward and reverse and then is held in place by four vertical bolts and two rear horizontal bolts whereas the 85-86 carrier was held with a clamp or pinch design.