Mechanical engineering: 2 stroke vs 4 stroke

In the 2 stroke engine it consists of one cycle with one rotation
In the 4 stroke engine it consists of one cycle with two rotations.
The inlet and the exhaust valves of the 4 stroke engine are replaced by 3 ports in a 2 stroke engine.
In 2 stroke engine the lubrication oil must be mixed with the petrol
In case of 4 stroke engine the lubrication and the fueling must take place separately
In the 2 stroke engine due to the presence of the lubrication oil, some of the lubrication oil must be combusted during the time of heat addition. Hence there is more friction and loss of work in 2 Engine
The power available in the 2 stroke engine is only 70% of the calculated power
In 4 stroke engine the power available is 90% of the calculated power

In 2 stroke engine the transfer port and the exhaust port are opened at the same time. Hence some fresh air fuel mixture will be escaped out of the engine cylinder, due to which there is loss of fuel.
For single cylinder engine the size of the flywheel is bigger than the 4 stroke engine.
Due to the above reason the 2 stroke engine on the roads are replaced by the 4 stroke engine
The overall efficiency of a 4 stroke engine is much higher than that of a 2 stroke engine.

Mechanical engineering