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  2. Evinrude Outboard Motors - Wikipedia

    en.wikipedia.org/wiki/Evinrude_Outboard_Motors

    "Compared to a similar 2004 four-stroke engine, carbon monoxide emissions with Evinrude E-TEC are typically 30 to 50 percent lower; and at idle are lower by a factor of 50 to 100 times. In addition, Evinrude E-TEC emits 30 to 40 percent less total particulate matter on a weight basis than a similar “ultra-low emissions” four-stroke outboard.

  3. Valve timing - Wikipedia

    en.wikipedia.org/wiki/Valve_timing

    Valve timing diagram for a 4-stroke engine. With traditional fixed valve timing, an engine will have a period of "valve overlap" at the end of the exhaust stroke, when both the intake and exhaust valves are open.

  4. Variable valve timing - Wikipedia

    en.wikipedia.org/wiki/Variable_valve_timing

    Until about this time an engine's idle RPM and its operating RPM were very similar, meaning that there was little need for variable valve duration. The first use of variable valve timing was on the 1903 Cadillac Runabout and Tonneau created by Alanson Partridge Brush Patent 767,794 “INLET VALVE GEAR FOR INTERNAL COMBUSTION ENGINES” filed ...

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  6. Yamaha T-150 - Wikipedia

    en.wikipedia.org/wiki/Yamaha_T-150

    The Yamaha T-150 is an underbone model manufactured by Yamaha Motor Company since 2015. It is marketed under the names Exciter 150 / 155 in Latin America, Thailand and Vietnam, Sniper 150 MXi in the Philippines and Singapore, Jupiter MX/MX King 150 in Indonesia and Iran, and Y15ZR / Y16ZR in Malaysia.

  7. Multi-valve - Wikipedia

    en.wikipedia.org/wiki/Multi-valve

    A cylinder head of a four valve Nissan VQ engine engine. A multi-valve or multivalve engine is one where each cylinder has more than two valves (an intake, and an exhaust).A multi-valve engine has better breathing, and with more smaller valves (having less mass in motion) may be able to operate at higher revolutions per minute (RPM) than a two-valve engine, delivering more power.

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