During which stroke is the air/fuel mixture drawn into the cylinder?

The air/fuel mixture is drawn into the cylinder during the intake stroke. This stroke begins when the piston moves down the cylinder, creating a vacuum that allows the air/fuel mixture from the carburetor or fuel injection system to be drawn into the combustion chamber. This action is essential because it prepares the mixture for the subsequent compression and power strokes where combustion will occur.

In contrast, the power stroke occurs after the mixture has been compressed and ignited, where the energy from the explosion drives the piston down. The compression stroke follows the intake stroke, where the piston moves back up the cylinder, compressing the air/fuel mixture before ignition. Lastly, the exhaust stroke is the phase where the burnt gases are expelled from the cylinder after the power stroke. Each of these strokes plays a crucial role in the engine's operation, but only the intake stroke directly involves drawing in the air/fuel mixture.