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An engine creates a vaccuum. This sucks in air, past a metered hole in the carb. This sucks a vapor spray of gas, which mixes with the air. This mixture passes through the intake manifold runners, into the cylinder head runners. When the intake valve opens, the mixture is sucked into the cylinder. The piston comes up to compress the mixture. When it is almost all the way up, the spark plug ignites the mixture, causing an explosion, which blows the piston back down. This is called the power stroke. Then, the exhaust valve opens, and the piston starts back up, which pushes out the burned fuel, which travels out the exhaust. The piston starts back down, and the intake valve re opens, which sucks the next charge in, and restarts the process. That is why it is a 4 stroke motor. 4 strokes per cycle.

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