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  2. Yamaha RD500LC - Wikipedia

    en.wikipedia.org/wiki/Yamaha_RD500LC

    Linked Yamaha YPVS exhaust power valves are controlled by a single electronic unit and servo motor and are designed to give a broader power band. The engine also features intake reed valves unlike the YZR500 racer which used rotary disc valve induction.

  3. Yamaha FS1 - Wikipedia

    en.wikipedia.org/wiki/Yamaha_FS1

    The Yamaha FS1-E has a 49 cc (3.0 cu in), single cylinder, two-stroke, air-cooled, rotary disc-valved engine with a four-speed gearbox. The FS1-E was the FS1 with the suffix E, which stood for England (differing from the models sold in other countries as the FS1-E had more cycle parts in common with other UK-imported Yamaha models).

  4. 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 ...

  5. Two-stroke engine - Wikipedia

    en.wikipedia.org/wiki/Two-stroke_engine

    A familiar type sometimes seen on small motorcycles is a slotted disk attached to the crankshaft, which covers and uncovers an opening in the end of the crankcase, allowing charge to enter during one portion of the cycle (called a disc valve). Another form of rotary inlet valve used on two-stroke engines employs two cylindrical members with ...

  6. Rotary valve - Wikipedia

    en.wikipedia.org/wiki/Rotary_valve

    A rotary valve (also called rotary-motion valve) is a type of valve in which the rotation of a passage or passages in a transverse plug regulates the flow of liquid or gas through the attached pipes. [1] The common stopcock is the simplest form of rotary valve. Rotary valves have been applied in numerous applications, including:

  7. Derbi GPR125 - Wikipedia

    en.wikipedia.org/wiki/Derbi_GPR125

    The Derbi GPR 125 is a street motorcycle sold by Derbi - Nacional Motor since 2005. [2] The original GPR125 was powered by a single-cylinder two-stroke engine with a steel lined cast iron cylinder manufactured by Yamaha, but was superseded in 2010 by an all-new DOHC four-stroke four-valve model.

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  9. Cylinder head porting - Wikipedia

    en.wikipedia.org/wiki/Cylinder_head_porting

    Rotary disk valve engines with wide sweeping transfers can be so wide as to be impractical as a parallel twin. The V-twin and fore-and-aft engine designs are used to control overall width. Cylinder distortion: Engine sealing ability, cylinder, piston and piston ring life all depend on reliable contact between cylinder and piston/piston ring so ...

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