2-stroke & 4-stroke Engine comparison

 2-Stroke Engine cycle in comparison to 4-stroke Engine:

2-Stroke Engine	4-Stroke Engine
2 strokes to complete 1 working cycle	4 strokes to complete 1 working cycle
Air intake through scavenge ports	Air intake through suction valves
Low Speed Engines	High Speed Engines
Higher power	Lesser power
Expensive parts	Cheaper parts

Advantages of 2-stroke Engines in comparison to 4-stroke engines:

Two-stroke engines do not have suction valves, hence simple construction.

Two-stroke engines have a high power-to-weight ratio (because the engine has twice as many combustions per second as a four stroke engine revolving at the same speed).

Two-stroke engines have the potential for about twice the power in the same size because there are twice as many power strokes per revolution.

Two-stroke engines are lighter, and cost less to manufacture.

Disadvantages of 2-Stroke Engines in comparison to 4-stroke engines:

Two-stroke engines don't live as long as four-stroke engines as its parts wears out faster due to the lack of a lubrication system.

Two-stroke engines require a mix of oil with the gas to lubricate the crankshaft, connecting rod and cylinder walls.

Two-stroke oil can be expensive.

Two-stroke engines do not use fuel efficiently.

Two-stroke engines produce more pollution.