When it comes to outboard motors, there are two essential categories: two stroke and four stroke. Both of these engine types have advantages and disadvantages, and the choice will depend on how you intend to use your outboard motor. For example, two stroke engines accelerate more quickly, and are faster. Two stroke engines are also often cheaper and tend to withhold their value during resale. Four stroke engines provide a smoother ride and are more economical. Because they move slower, four stroke engines are quieter and also cause less harm to the marine environment.
Four stroke engines are a bit newer in the market, and thus improvements are still being made frequently. Also remember with both kinds of outboard engines, you will need to special Evinrude oil, which is formulated for both two stroke and four stroke outboard motors.