How does a 2-stroke engine work?

Answer 1

1) As the piston moves from bottom dead center to top dead center it creates a

vacuum to draw the fuel / air mixture through the carburetor and past the reed valve assembly.

2) The piston moves down from top dead center to bottom dead center. The reed closes, causing the pressure to build in the cylinder. The movement of the piston uncovers the intake port and pressurized the fuel / air mixture.

3) The piston now moves up from bottom dead center to top dead center, effectively ending a cycle and starting another. The spark plug ignites the compressed mixture, sending piston back down.

4) At this point the piston uncovers the exhaust port, allowing the spent gasses to escape. As it continues to bottom dead center, it uncovers the intake port and allows the fuel / air mixture through the carburetor and past the reed valve assembly.
A two stroke engine uses a mixture of fuel and oil for its fuel. On the up stroke, the piston compresses the air/fuel mix in the combustion chamber. At the same time it pulls a fresh air/fuel mix into the crank case for the next cycle. When the ignition sparks, it burns the mix forcing the piston downward, opening the exhaust port while simultaneously forcing the air/fuel mix that was in the crank case into the combustion chamber, as well as the spent exhaust out through the exhaust port. At this point it repeats the process.

That is why you mix the fuel and oil together. The oil in the mix is what lubricates the motor.
when the inlet port is opened the air fuel mixture enters to the cylinder during suction stroke and compression takes place at the end of compression spark plug will produce the spark and air fuel burning takes place and it expands inside the cylinder (power stroke)and remaining exhaust gas sent to the atmosphere.