![]() What is the difference between two-stroke and four-stroke outboard motors?Ī two-stroke, or two-cycle, outboard motor completes the power cycle with two strokes. Only air is introduced through the outboards air intake. With Direct Injection, also called Electronic Direct Fuel Injection, an exact amount of fuel is injected directly into the cylinder under high pressure. This controls the amount of fuel/air vapor entering the chamber, enhances engine power, and lessens pollution. In electronic fuel injection, a computer introduces a precise amount of fuel into the outboards air intake manifold. Contemporary outboard motors with carburetors keep the oil separate, offering a cleaner exhaust. The oil provides lubrication as the fuel is used. ![]() Older outboard motors are generally carburetor-driven and require a special oil to be premixed with the gas before its added to the tank. What is the difference between fuel systems? For example, inflatable boats average between 9 and 25 HP, while pontoon vessels can go as high as 300 HP, depending on the model. How high you can go depends on what kind of boat you have. Remember that horsepower equals performance. You should always get an outboard motor with the maximum horsepower your boat is rated for. ![]() A handle is attached to the top of the outboard motor so that you can use the direction of the propeller to steer the boat. From there, it can be tilted forward on a pivot to lift the entire motor out of the water. What does the "outboard" in outboard motor mean?Īn outboard motor is attached to the transom and hangs outside the back of the vessel so that the propeller is submerged. Knowing what to ask when buying an engine from Yamaha, Mercury, Honda, or another manufacturer is critical. Additionally, an outboard engine affects both safety and performance. Your boats speed and handling depend directly on the outboard engine used to power it.
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