1. On the negative side first, the intake valve opens and air / fuel mixture enters the combustion chamber.
2. On the upstroke, the intake valve closes and the fuel / air.
3.Ignition happens to candle (not shown), the fuel / air mixture to explode, and the piston is forced down for the second time in the cycle. This is called "power stroke".
4. Exhaust valve is open and the piston moves up and the second period, and Exhaust gases are expelled through the exhaust valve in the muffler.
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