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2. Four-stroke engine - Wikipedia

   en.wikipedia.org/wiki/Four-stroke_engine

   Four-stroke cycle used in gasoline/petrol engines: intake (1), compression (2), power (3), and exhaust (4). The right blue side is the intake port and the left brown side is the exhaust port. The cylinder wall is a thin sleeve surrounding the piston head which creates a space for the combustion of fuel and the genesis of mechanical energy.

3. Otto cycle - Wikipedia

   en.wikipedia.org/wiki/Otto_cycle

   The power produced by the Otto cycle is an energy developed per unit of time. The Otto engines are called four-stroke engines. The intake stroke and compression stroke require one rotation of the engine crankshaft. The power stroke and exhaust stroke require another rotation. For two rotations there is one work generating stroke..

4. Scavenging (engine) - Wikipedia

   en.wikipedia.org/wiki/Scavenging_(engine)

   Scavenging is the process of replacing the exhaust gas in a cylinder of an internal combustion engine with the fresh air/fuel mixture (or fresh air, in the case of direct-injection engines) for the next cycle. If scavenging is incomplete, the remaining exhaust gases can cause improper combustion for the next cycle, leading to reduced power output.

5. Four-stroke power valve system - Wikipedia

   en.wikipedia.org/wiki/Four-stroke_power_valve_system

   The servo motor controls the valve via two cables. Shown removed. 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]

6. Stroke (engine) - Wikipedia

   en.wikipedia.org/wiki/Stroke_(engine)

   Stroke (engine) In the context of an internal combustion engine, the term stroke has the following related meanings: A phase of the engine's cycle (e.g. compression stroke, exhaust stroke), during which the piston travels from top to bottom or vice versa. The type of power cycle used by a piston engine (e.g. two-stroke engine, four-stroke engine).

7. IOE engine - Wikipedia

   en.wikipedia.org/wiki/IOE_engine

   Yale IOE engine from 1911. The intake/inlet over exhaust, or "IOE" engine, known in the US as F-head, is a four-stroke internal combustion engine whose valvetrain comprises OHV inlet valves within the cylinder head and exhaust side-valves within the engine block.