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  2. Cylinder head porting - Wikipedia

    en.wikipedia.org/wiki/Cylinder_head_porting

    The wave activity in the port/runner does not stop but continues to reverberate for some time. When the valve next opens, the remaining waves influence the next cycle. This graph shows the pressure taken from the valve end (blue line) and the runner entrance(red line) of an engine with a 7-inch (180 mm) port/runner and running at 4500 rpm.

  3. Aprilia SR50 - Wikipedia

    en.wikipedia.org/wiki/Aprilia_SR50

    Scooter: Engine: 49.38 cc (several different engines used) Top speed: 45-50 km/h restricted, up to 85-90 km/h derestricted. Optional gear up kits available, they can lift the maximum speed up to 130 km/h. Transmission: CVT: Suspension: Front telescopic fork, rear hydraulic monoshock: Brakes: 190mm disks front and rear: Tires: 13" wheels 130/60 ...

  4. Base 50 - Wikipedia

    en.wikipedia.org/wiki/Base_50

    With multiple manufactures utilizing clones of the Honda 50 engine for current mopeds, scooters, small motorcycles and power sport machines, it is the most produced engine in history. The engines are usually identical in form, fit and function to Honda 50cc engines and the parts are usually interchangeable with genuine Honda parts.

  5. Honda CHF50 - Wikipedia

    en.wikipedia.org/wiki/Honda_CHF50

    The Honda CHF50 is a scooter made by Honda and marketed as the Metropolitan in the United States, the Jazz in Canada, the Scoopy in Australia and Asia, and the Crea Scoopy in Japan. Offered in the United States from 2002 to 2009, the Metropolitan was reintroduced in 2013 based on the fuel-injected and air-cooled NCH50 instead of the prior CHF50.

  6. Two-stroke power valve system - Wikipedia

    en.wikipedia.org/wiki/Two-stroke_power_valve_system

    The only moving parts inside simple two-stroke engines are the crankshaft, the connecting rod, and the piston. It is the same simplicity in design, however, that causes a two-stroke engine to be less fuel-efficient and produce high specific levels of undesirable exhaust gas emissions. At the bottom of the power stroke, the transfer ports, which ...

  7. GY6 engine - Wikipedia

    en.wikipedia.org/wiki/GY6_engine

    The GY6 engine design is a four-stroke single-cylinder in a near-horizontal orientation that is used on a number of small motorcycles or scooters made in Taiwan, China, and other southeast Asian countries. It has since become a generic technology.

  8. Gilera Runner - Wikipedia

    en.wikipedia.org/wiki/Gilera_Runner

    In 1998, the 125 cc (7.6 cu in) FX Runner was introduced which had the same styling as the 50cc. In 1999, the SP model was released. The biggest difference between the FX (FXR) and the SP is the FX had a 9 L (2.0 imp gal; 2.4 US gal) petrol tank and battery stowed near the spark plug and a rear drum brake.

  9. Honda PC50 - Wikipedia

    en.wikipedia.org/wiki/Honda_PC50

    The Honda PC50 is a moped produced by the Honda Motor Company in Japan from May 1969 until at least 1983. The PC50, though much smaller and lighter, had some similar features to Honda's popular C50 /70 /90 Super Cub line, with a step-through pressed-steel frame, a fuel tank under the saddle, a chain cover, and optionally equipped with leg shields,

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