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A four stroke engine requires the piston to travel up and down a total of 4 times to complete one full combustion process. The 4 strokes are: intake, compression, power (ignition), exhaust. And the intake and exhaust valves are timed accordingly.

A two stroke engine fires ever other stroke and uses ports for intake and exhaust (no valve train)

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Linnea Beatty

Lvl 10
2y ago

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