The 2-stroke engines are used for vessel propulsion and are bigger in size as compared to the 4-stroke engines. In this engine, the complete sequence is complete in two cycles i.e.
2 stroke engines typically have a higher power-to-weight ratio, which makes them ideal for use in smaller marine vessels where weight is a concern. These engines tend to produce more pollution and noise compared to 4-stroke engines, and they may not be as fuel efficient.
Additionally, 2-stroke engines require the use of a special oil mixture in order to lubricate their internal components, which can be more expensive and time-consuming to maintain.