What is a 4-stroke motor?

Intake, compression , power, exhaust. (1)The piston is drawn back and an air and gas mixture is let into the cylinder while the valves are open (2)The valves close while the piston is pushed into the cylinder to compress the mixture (3)The spark plug fires pushing the piston back which turns the crankshaft with all the power given off by the spark plug explosion (4)The piston pushes out the burnt fuel through the open valves, and gets ready to bring in the next batch of fuel mixture.