To combat this, electronic oil mixing is used to create little to no exhaust smoke. Their downfalls were that they were heavier, less portable and slower accelerating. While 2 and 4 stroke motors have become more similar in the benefits they offer, the way they work internally differs.
In 2 stroke motors, oil is blended with gasoline. As the fuel goes through the engine, it consumes small amounts of oil for lubrication. Therefore, oil changes are not required to power the engine because the oil is continuously injected.
The customer simply maintains an oil reservoir either located in the boat or on the engine. In 4 stroke motors, there is an oil filter and self-contained oil cavity within the engine, similar to the way it works in a car. An oil change is typically required after hours or one year of use. One of the biggest things to look for when choosing an outboard motor is reliability.
When in doubt, do your research online and look at reliability ratings for different motors. It can also help to talk to other people in the boating community who have had personal experience with different types of boat and motor combinations. Depending on the size of your boat, weight may be a concern when choosing an outboard motor.
However, this has become less of a concern with 4 strokes, as they are now much lighter than they were in years past. As stated previously, 2 stroke motors used to be the choice among those looking for speed.
Every manufacturer is different, and there are even different variations between products from the same manufacturer. Always do your research and compare. In the past, 2 stroke motors burned more fuel than 4 strokes. However, the 2 cycle product is now much more efficient in its injection methods used to bring fuel into the engine.
As long as it is a modern-day 2 stroke, it is most likely comparable to 4 strokes when it comes to fuel efficiency.
When deciding between a 2 and 4 stroke outboard motor, it all comes down to your preferences and the type of boat you have. Looking at manufacturer statements and boat tests online can also help guide you in your search. The environment in which you use your boat is another important factor to consider. Finally, selecting a product largely depends on who your local dealer is. Sometimes, this decision is not just about the engine itself, but rather, your ability to get support for the product when it breaks down or needs annual service.
If you are more comfortable with a particular dealer when it comes to getting service or picking up parts, chances are, you will be able to find a motor from them that works for your boat. The technology behind 2 and 4 stroke engines is very different, so having training on each type of product is key. At Marine Mechanics Institute in Orlando, Florida , students work with the fuel systems on both types of engines in order to prepare for a career in the field.
In addition to this, MMI students enrolled in the week Marine Technician Specialist training program learn everything from basic engine theory to the more technical aspects of marine product service, rebuilding, troubleshooting and repair. Students complete three-week, manufacturer-specific courses designed to provide them with technical and hands-on training specific to the following brands:. Now is an exciting time to pursue a career in the marine industry.
Wondering what types of careers marine technicians can pursue? Check out our career guide. From inboard gas and diesel to outboard 2 and 4 stroke motors, your training will cover a wide variety of topics. To learn more, visit our program page and request information today. Diesel engines generally run for a couple thousand more hours than their gasoline counterparts.
Diesel engines also generally have more horsepower than the typical gasoline engine. They are also more efficient due to the type of fuel. Diesel engines, however, are more expensive and heavier than gasoline engines. They are also louder than gas engines. It is not necessary to have a diesel engine for your vessel. Despite the higher horsepower and additional longevity, getting a diesel engine is not always what is needed. Gasoline engines are getting better every year, and their lifespan is continuing to grow.
They are also making great strides in reducing emissions and making them more fuel-efficient. Your boat also might not need the amount of horsepower a diesel engine provides, and you should not buy a motor with more horsepower than your boat can handle. Not only will it be more expensive, but it can cause great risk for your boat, your motor, and even your passengers. First things first, you want the motor to be clean. If the motor is not clean, it is safe to assume the previous owner did not properly care for it.
You also want to pay special attention to gunk or grime deposits. Not only do these indicate motor neglect, but it could also be evidence of ethanol contamination on a gas-powered engine. Most gasoline fuels that are made today use some amount of ethanol in them. Marine engines were historically not designed to run on this type of fuel, and non-ethanol marine fuels are not always available. As a boat owner, you will want to make sure if you are not buying ethanol-free fuel, add the proper additives to lessen any possible ethanol problems.
You also want to test the used motor and make sure every aspect is in working order. Check for signs of smoke, excessive noise, or vibrations. One major factor in engine life is whether or not the engine uses diesel or gas. To keep your engine from wearing out, you will need to make sure you change the oil at the proper intervals.
This recommends oil changes for standard use. If you are traveling and have a hefty load, dirty air, or high temperatures, you will want to consider changing the oil more often. If this is not the case, there is no benefit to changing your oil more often than is recommended.
But do change it at least once per year. Rough operation techniques can include extended low-speed operation, incomplete burning of fuel, or weighty loads. You can also consider using synthetic oil. Synthetic oil often lowers wear rates compared to petroleum oil. It is hard to say how much this extends engine life, but it should help.
If you keep your boat somewhere where the weather gets cold, you should drain and refill the oil before the boat is winterized. When you start your boat back up in the spring, you will want to make sure you let the engine idle to recirculate the oil. Since the oil has probably settled, you will need the oil circulated back through the system. When you change the oil, make sure you change the filter as well.
You should keep track of the date you change the oil and filter, so you know when you need to do it next. You can also try to motor at the most efficient cruising speed for your vessel and motor. This will burn the least amount of fuel, which can extend engine life.
No matter what type of engine, the components inside can be at risk with saltwater exposure. Saltwater can cause corrosion in metal. This can be combatted by inspecting your engine for corrosion regularly. When you find corrosion, you will want to deal with it immediately.
To deal with corrosion, you will need to remove it down to the bare and base metal. One person I spoke with, a charter fishing captain from eastern Long Island, has almost 6, hours on his Yamaha four-stroke. This is a guy who puts so many hours on his engines, he buys his two-stroke oil by the gallon drum. The E-TEC G2s are all digital, but he wanted to keep his existing steering and controls; the mechanical Yamahas let him do that.
All of these guys do two things to extend the lives of their motors: They keep up with regular maintenance, and they wage a constant war against corrosion. Outboards, diesels and inboards are more likely to succumb to corrosion than to overuse—but corrosion is easy to defeat. Keep it at bay, and a modern outboard motor should keep cranking for thousands of hours of operation. And when it comes to boats, as Capt.
Everything you need to know—everything you can do without being a trained outboard mechanic—is in there, and the most important pages deal with routine maintenance schedules, as specified by the manufacturer. Follow these schedules religiously.
Typically, this means changing the lower-unit lube every hours or at lay-up , and on a four-stroke, the crankcase oil, too. You can suck out the crankcase oil through the dipstick tube but changing the lower-unit lube means hauling the boat. Some manufacturers, like Yamaha, suggest changing the water-pump impeller at the same interval, which means dropping the lower unit as well.
Service the thermostat at the same time; overheating shortens the life of any engine. Evinrude E-TECs have a longer service interval than other outboards: five years or hours for the latest G2 engines. Being two-stroke engines, they have no crankcase oil to change, and have fewer moving parts than four-strokes; that means fewer parts that need maintenance, and fewer parts to fail.
In the past, common maintenance items such as spark plugs, water pumps, lower-unit lube and fuel filters were replaced on a yearly basis, even if they did not need it, she said. Water pumps, for example, can last for hundreds of hours unless they suck in a lot of sand or other debris. Ultimately, the proper care of the outboard—meaning service, replace when necessary, lubricate when recommended—extends the life of the motor. And, she added, outboards that are used more frequently are known to last longer.
E-TECs are sophisticated, with digital steering and controls and other interesting high-tech capabilities: For example, they can be winterized via the electronic control panel. Funny thing about that motor—it only had two speeds, idle and wide-open. Some external filters can be drained, others have spin-off canisters that are replaced; some, like those from Mercury, have water sensors that warn you when the filter needs attention.
Tohatsu Outboards Tohatsu 2. Free Shipping see details Monthly Payments. Home Outboard Motors Basics How long does an outboard motor last? How long does an outboard motor last? Brand 2- or 4-stroke engines gas vs.
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