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How to Choose an Outboard Motor For Your Boat

Whether you're looking to buy a new motorboat or need to replace the motor on your current boat, you may be wondering how to choose an outboard motor. Outboard motors present a range of options, from two-stroke to four-stroke, and direct fuel injection to electronic fuel injection. Here are a few considerations to keep in mind as you select an outboard motor for your boat.


Should I Get a Four-Stroke or Two-Stroke Engine?

It used to be that a two-stroke engine was the go-to for outboard motors, according to Discover Boating. Traditionally, two-stroke engines have been lightweight and have had good throttle response, says, while four-stroke engines have offered a cleaner, more refined performance. As environmental standards have changed and boaters look for a clean, efficient engine, notes that modern outboard motors have evolved — narrowing the differences between four- and two-stroke engines.

Two-Stroke Engines

Two-stroke engines burn a mix of gasoline and oil, says Boating Magazine. In the past, a carburetor or injector fed the mixture into the engine cylinder through an intake valve. But, this led to a lot of fuel escaping, as the exhaust valve remained opened during this process. However, today’s two-stroke engines have been designed to prevent this loss of fuel.

Four-Stroke Engines

Four-stroke engines are similar to what your car would have, says Boating Magazine — they have cylinders that burn gasoline and a separate system to lubricate the engine with oil. Intake and exhaust take place at different times as the pistons move. notes that this has historically meant that four-stroke engines don’t offer as much power as two-stroke engines. Modern fuel injection systems, however, have led to better fuel economy for four-stroke engines while manufacturers have upgraded the engines to be more powerful.

How Does Fuel Injection Work on Outboard Motors?

Manufacturers are now building outboard motors that are more fuel-efficient and low-emissions, says Discover Boating, thanks to modern fuel injection systems.

Direct Fuel Injection (DFI)

According to Boating Magazine, DFI two-stroke engines feed the fuel mixture into the cylinder while the piston covers this exhaust valve. This prevents the loss of fuel that occurred with older engines. DFI engines are available in both two-and four-stroke engines. They use less fuel, have increased engine power and have low emissions, says Discover Boating. They also don’t require fuel priming and are quick to start.

Electronic Fuel Injection (EFI)

With EFI engines, the fuel mixture is injected into each cylinder’s incoming air before it reaches the intake valve, says Discover Boating. The fuel spray then cools the intake valve, increasing vaporization before it reaches the combustion chamber. The fuel and air mixture is then ignited by a spark plug, says Discover Boating. EFI engines do not require fuel priming, and they have low emissions. They’re also quick to start and have lower fuel consumption without sacrificing performance, according to Discover Boating.

How Much Horsepower Do I Need for My Boat?

Simply put, it’s typically a good idea to get an outboard motor with the maximum horsepower recommended by your boat’s manufacturer, says Discover Boating. While more horsepower certainly means more speed, it will also help with handling at slower speeds or in rougher water.

Discover Boating suggests keeping in mind how you’ll be using the boat. While the test run may seem great, you may not be so thrilled with that smaller outboard motor when it’s more than just you and the dealer on the water. You’ll likely want something with more horsepower if you typically have multiple people on board, plan on water skiing or have lots of food and gear with you regularly.

Are There Electric Outboard Motors?

There are electric outboard motors available, and they may be a good fit for smaller boats or those who enjoy inland fishing, says Electric outboard motors are lightweight, very quiet and low-maintenance. You’ll likely need to replace the battery every few years, says, but you’ll be saving on fuel costs, as electric outboard motors generally just need an overnight charge (which won’t likely run up your electric bill noticeably).

As outboard motor designs evolve, there are a lot of options available. With a little knowledge, you can be better prepared to choose the right outboard motor for your boat.

How to Keep Your Outboard Motor in Excellent Condition

Outboard motors are portable, lightweight, and easy to use. It’s no wonder why so many boaters choose to use them. They also come in a wide range of styles, which makes them ideal for various types of applications. However, like any internal combustion engine, you’ll need to do your due diligence to keep it performing well. This means you’ll need to perform regular maintenance on your outboard to keep it up and running. Eric’s Outboard Marine has gathered some helpful tips below.

If you’re still searching for the perfect engine, stop by our dealership in Miami, FL. We’ve got an impressive selection for you to choose from, including plenty of Yamaha outboard motors.

Routine Motor Maintenance

Believe it or not, simple routine maintenance will play a major role in keeping your outboard out of the shop for a longer period of time. Remember that it uses internal combustion to generate power, which means it operates similarly to the engine of a car or motorcycle. When you’re ready to begin, remove the cowling or outer cover of the outboard that protects it from the water. Examine it for any signs of leakage, specifically at the joints where the parts come together.

You should unplug the battery prior to inspecting the spark plugs, which should be clean and free of oil in their intact ceramic housing. When the time comes to reinstall the spark plugs, make sure that you’re torquing them to the manufacturer’s specifications. On that note, you should always be referring to the owner’s manual for your Yamaha outboard motor when you’re performing maintenance.

Next, check the oil to confirm that it’s not dark or sludgy. If there happen to be any metal shavings in it, this could indicate that motor parts are grinding together. This issue will require a specific level of expertise, so leave it to a professional. Due to how these engines operate, they will churn through oil much faster than car motors. You don’t want the oil to disappear too quickly, though, as it could mean there’s a leak. Check the air filter, which shouldn’t be too dirty. Examine the fuel line and be sure it’s in good shape and attached securely.

After Each Trip

After each and every trip on the water, you’ll need to perform maintenance. Begin by rinsing and flushing the engine. Saltwater and freshwater can be corrosive and lead to damage if you skip this step. Start it up when your craft is out of the water and leave it in neutral as it pumps out the water. Unhook the fuel line and allow the engine to burn off the remaining fuel, which will prevent it from sitting inside the engine and corroding it. Clamp the fuel line before you attempt this, which will prevent gasoline from spraying all over the place. After your engine sputters dry, you can proceed to shut it off and hit the battery switch if applicable.

Professional Outboard Motor Maintenance

Finally, you’ll still need to consult a professional for annual maintenance. If you’re the proud owner of a Yamaha outboard motor, you want to keep it in excellent shape. A professional will be able to address certain areas of concern you might’ve missed. There’s also the chance that you’ll run into an issue during your own inspection that’s out of your scope. Your friends at Eric’s Outboard Marine are happy to assist. You don’t want to wait until problems become too severe for repair. We’re confident that we can help you keep your engine in the best shape possible.

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