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In a typical two stroke (petrol) engine, the valves are replaced by ports in the cylinder wall, and closed / unclosed by the motion of the piston.

Piston rising, vacuum under draws (fuel) mix into the crankcase through the carburettor.

Piston falling, inlet port closes, pressure forces mix up through transfer ports into combustion chamber.

Rises and fires at TDC, then falls to uncover exhaust port.

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