There's a great website that provides an animated look at how engines work.
The crankcase of a two-stroke engines pulls in the gas/air mixture.
During the downward stroke of the valve, the gas/air mixture is compressed to the top of the crankcase. And then at the end of the stroke, the remaining fuel mixture is released into the exhaust.
Yeah, this is a really simple definition, but here's how it looks:





















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