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2. Petcock - Wikipedia

   en.wikipedia.org/wiki/Petcock

   Fuel petcock on a 1978 Yamaha XS400. Most older motorcycles have a three-position fuel petcock valve (known as a "petrol tap" in the UK) mounted on or nearby the fuel tank to control the supply of gasoline: on, off, and reserve. The reserve position accesses the bottom portion of the fuel tank.

3. Outboard motor - Wikipedia

   en.wikipedia.org/wiki/Outboard_motor

   Mercury Marine, Mercury Racing, Tohatsu, Yamaha Marine, Nissan and Evinrude each developed computer-controlled direct-injected two-stroke engines. Each brand boasts a different method of DI. Fuel economy on both direct-injected and four-stroke outboards measures from a 10 percent to 80 percent improvement compared with conventional two-strokes.

4. Shutdown valve - Wikipedia

   en.wikipedia.org/wiki/Shutdown_valve

   For air intake shut down, two distinct types are commonly utilized, i.e. butterfly valves and swing gate or guillotine valves. Because diesel engines ignite fuel using compression instead of an electronic ignition, shutting off the fuel source to a diesel engine will not necessarily stop the engine from running.

5. Mercury Marine - Wikipedia

   en.wikipedia.org/wiki/Mercury_Marine

   Headquarters A Mercury 50 HP outboard motor circa 1980 Six cylinder two-stroke engine in 1984. Mercury Marine is a ... a small outboard ... off the engine and ...

6. 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 ...

7. Poppet valve - Wikipedia

   en.wikipedia.org/wiki/Poppet_valve

   The use of the word poppet to describe a valve comes from the same word applied to marionettes, which, like the poppet valve, move bodily in response to remote motion transmitted linearly. [3] [4] In the past, "puppet valve" was a synonym for poppet valve; [5] [6] however, this usage of "puppet" is now obsolete.