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  2. Four-stroke power valve system - Wikipedia

    en.wikipedia.org/wiki/Four-stroke_power_valve_system

    A four-stroke power valve is a device fitted to four-stroke engines that constantly adjusts the internal diameter of the exhaust system to better suit the speed of the engine. Yamaha was the first to develop such a system, called the Exhaust Ultimate Power Valve (EXUP). [1] It first appeared on the Yamaha FZR EXUP and was later used on many ...

  3. Honda Marine - Wikipedia

    en.wikipedia.org/wiki/Honda_Marine

    Honda Marine logo. Honda Marine is an American company headquartered in Alpharetta, Georgia. [1] Honda Marine is part of "Honda’s Power Products" division. [1] They build a full line of four-stroke outboard marine engines. They were the second U.S. company to build a four-stroke marine outboard engine. They manufactured the first marine ...

  4. 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. The intake valve is opened before the exhaust gases have completely left the cylinder, and their considerable velocity assists in ...

  5. Outboard motor - Wikipedia

    en.wikipedia.org/wiki/Outboard_motor

    In 1990 Honda released 35 hp and 45 hp four-stroke models. They continued to lead in the development of four-stroke engines throughout the 1990s as US and European exhaust emissions regulations such as CARB (California Air Resources Board) led to the proliferation of four-stroke outboards. At first, North American manufacturers such as Mercury ...

  6. Desmodromic valve - Wikipedia

    en.wikipedia.org/wiki/Desmodromic_valve

    A desmodromic valve is a reciprocating engine poppet valve that is positively closed by a cam and leverage system, rather than by a more conventional spring. The valves in a typical four-stroke engine allow the air/fuel mixture into the cylinder at the beginning of the cycle and exhaust spent gases at the end of the cycle. In a conventional ...

  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.

  8. List of Honda engines - Wikipedia

    en.wikipedia.org/wiki/List_of_Honda_engines

    12.5 hp Honda CRF150L; Honda New Mega Pro; GL150 ... Honda CRF230? Four-stroke, SOHC 2-valve, Single-Cylinder, Air-cooled. ... The water-cooled outboard motor is ...

  9. Variable valve timing - Wikipedia

    en.wikipedia.org/wiki/Variable_valve_timing

    Cylinder head of Honda K20Z3.This engine uses continuously variable timing for the inlet valves. Variable valve timing (VVT) is the process of altering the timing of a valve lift event in an internal combustion engine, and is often used to improve performance, fuel economy or emissions.

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