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  2. Yamaha SR400 & SR500 - Wikipedia

    en.wikipedia.org/wiki/Yamaha_SR400_&_SR500

    The SR400 has an air-cooled 4-stroke single cylinder SOHC 2-valve engine with a dry-sump, with the downtubes of the motorcycle's frame serving as the engine's oil reservoir and cooling system, [6] thereby eliminating the need for an external oil cooler, reducing engine pumping losses, and allowing increased ground clearance as well as reduced ...

  3. Four-stroke engine - Wikipedia

    en.wikipedia.org/wiki/Four-stroke_engine

    The amount of power generated by a piston engine is related to its size (cylinder volume), whether it is a two-stroke engine or four-stroke design, volumetric efficiency, losses, air-to-fuel ratio, the calorific value of the fuel, oxygen content of the air and speed . The speed is ultimately limited by material strength and lubrication.

  4. Ariel Square Four - Wikipedia

    en.wikipedia.org/wiki/Ariel_Square_Four

    MkII upper engine detail showing bolt-on cast aluminium exhaust manifolds, high-mounted carburettor with high inlet stub cast into the rocker box, and the rear-mounted distributor In 1953, the 'four pipe' 997 cc Ariel Square Four Mk II was released, with separate barrels, a re-designed cylinder head with four separate exhaust pipes from two ...

  5. List of motorcycles by type of engine - Wikipedia

    en.wikipedia.org/wiki/List_of_motorcycles_by...

    A transverse engine is an engine mounted in a vehicle so that the engine's crankshaft axis is perpendicular to the direction of travel. In a longitudinal engine configuration, the engine's crankshaft axis is parallel with the direction of travel. However, the description of the orientation of "V" and "flat" motorcycle engines differs from this ...

  6. Component parts of internal combustion engines - Wikipedia

    en.wikipedia.org/wiki/Component_parts_of...

    Snowmobiles Usually have one to four cylinders and can be both 2-stroke or 4-stroke, normally in the in-line configuration; however, there are again some novelties that exist with V-4 engines; Small portable appliances such as chainsaws, generators, and domestic lawn mowers most commonly have one cylinder, but two-cylinder chainsaws exist.

  7. Yamaha Genesis engine - Wikipedia

    en.wikipedia.org/wiki/Yamaha_Genesis_engine

    In a multivalve engine, maximum RPM is limited by the size of the largest valves: in a 3-valver, the exhaust valve is larger, and in a 4-valver, the inlet valves are larger. The significance of the five-valve engine compared to other multivalve configurations engines is that, like a 3-valver, there were more intake valves than exhaust valves ...

  8. Motorcycle components - Wikipedia

    en.wikipedia.org/wiki/Motorcycle_components

    The temperature range of an air-cooled two-stroke is even more extreme and component life even shorter than in an air-cooled four-stroke. As applied to motorcycles, two-stroke engines have some advantages over equivalent four-stroke engines: they are lighter, mechanically much simpler, and produce more power when operating at the high rpm power ...

  9. Villiers Engineering - Wikipedia

    en.wikipedia.org/wiki/Villiers_Engineering

    "jointly the two companies produce a vast range of two-stroke and four-stroke petrol engines and four-stroke diesel engines from 1/3 to 16 b.h.p. These are the engines which power many of Britain's two-stroke motor cycles, scooters and three wheelers, and the great majority of the motor mowers, cultivators, concrete mixers, generating sets ...

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