Best Lawn Mower Engines In 2020 – Reviews & Buying Guide

1. Briggs and Stratton 31R9072. Briggs and Stratton 33S8773. Briggs and Stratton 19 HP
Briggs & Stratton 31R907-0007-G1Briggs & Stratton 33S877-0019-G1Briggs And Stratton Vertical Engine 19 HP
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Our lawnmowers are an integral part of our household. These are the tools that keep our lawns looking great year-round. Most people use their lawnmower for gardening at least once a week, which means it is used quite often.

And it is only natural that the engine will need to be replaced at some point. But it can be daunting to find the best lawn mower engine when doing it for the first time.

So how do you decide among so many options? To help you through this process, we have compiled this buying guide that has all the information you might need. Let’s check it out!

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Factors To Consider Before Buying The Best Lawn Mower Engine

1. The Reliability

Whether you use your lawnmower sparsely or frequently, engine reliability is a huge factor that should be considered. Respectable brands assure reliability. The higher the quality, the longer will be its lifespan. It is recommended to steer clear of cheap unbranded engines when looking for the best lawn mower engine.

2. The Power

The lawnmower engines usually come in the range of 140cc to 190cc. Making a power choice is a matter of knowledge. More ccs mean more power, so the power you are going for will depend on the kind of work you are going to be doing with your mower.

Are you planning to cut extra long grass? If yes, then you will need a more powerful engine. On the other hand, if you are looking to trim a well-maintained lawn, then choose at the lower end of the power.

3. The Maintenance

A lawnmower engine’s longevity is highly dependent on its maintenance routine. Maintaining a lawnmower engine means changing its oil and air filter and cleaning the debris. You also have to take care of the engine oil that you use.

Commercial engines are designed to last for long hours of use. But if you are getting a consumer engine, you can make it last for years by maintaining it properly.

Top 9 Best Lawnmower Engines In 2020

1. Briggs & Stratton 31R907-0007-G1

Briggs & Stratton Best Lawn Mower Engine

Briggs and Stratton have been the trusted name for years when it comes to lawnmower engines and related products. They have been delivering high-quality products at reasonable prices.

And this engine is a perfect example of their commitment to superior service. This one is a single-cylinder engine of 500cc power and a 17.5 power rating. The engine comes with a premium Dual Clean system for air filtration.

The electric starter makes it very easy for your small lawn mower to work with ease. The Magnetron electronic ignition that is provided in this engine is maintenance-free. How great is that!

The Dura-Bore cast iron sleeve that comes with the cylinder ensures longevity. The muffler is pre-installed in the engine, and there is a 9 amp charging system too.

In less than 600 dollars, you get a supreme quality engine that is CARB compliant and hence highly trustable. This engine has a smooth performance due to the linear balancing system provided by Briggs & Stratton.

This product is sure to perform consistently without giving you any trouble. The manufacturers recommend that the lawnmower be maintained regularly to avoid any glitches that might occur from time to time. They also offer maintenance kits that you can make use of to keep your engine working smoothly for long.

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2. Briggs & Stratton 33S877-0019-G1

Briggs & Stratton 33S877-0019-G1

This is another one of Briggs & Stratton engines that is a great deal in a 500-dollar price range. This is a single-cylinder engine that provides a dependable power of 540cc.

That, coupled with a 19 horsepower rating, makes it an impressive engine to have in terms of efficacy. This engine comes with a pulse fuel pump and full-pressure lubrication with oil. The cooler operation is achieved by the Overhead Valve designed by Briggs & Stratton.

This OHV design also ensures a longer valve lifespan. There is a 9 am charging system that is included in the engine. Have you been looking for a replacement for your 33R877-0003-G1 engine model? If yes, then this engine will do the job very well.

The engine longevity is taken care of by the Dura-Bore cast iron cylinder sleeve. Electric start function makes it great for riding lawn mowers and alike. The Magnetron electronic ignition of this engine is maintenance-free, and hence you can be worry-free. Briggs & Stratton offers a pre-installed muffler in this engine model.

For even more reliability, you get a manufacturer’s warranty on this product. And this warranty works for both consumer use as well as commercial use of the product. This engine also comes with an oil filter and a fuel pump.

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3. Briggs And Stratton Vertical Engine 19 HP

Briggs And Stratton Vertical Engine 19 HP

Have you been looking for a good quality engine that doesn’t burn a hole through your pocket? If yes, then you have hit the jackpot with this Briggs & Stratton vertical engine. This is a great quality product that is available to you in less than 479 dollars.

The specifications of this engine include an impressive 540cc power with 19 HP. The air cleaner of this engine is a pleated paper filter. The filter also contains a foam pre-cleaner that offers maximum protection and extended engine lifespan. This 33R877-0029 model comes with a Dura-Bore cast iron cylinder so your engine can last longer.

Are you worried about your engine getting heated up? Briggs & Stratton have taken care of that with their Overhead Valve design that works the cooler operation and keeps the valves healthy.

The company has its patented linear balancing mechanism installed in this system for high performance. You get a 9 am charging system and an electric starter with this engine that is sure to make your life easy.

Various customers have mentioned that this engine is effortless to install and replace the original dead one. The fitting of this engine into the mower has also been observed to be very straightforward.

The only issue noted by some customers is that the exhaust muffler is side-mounted. This positioning causes the hot exhaust to blow directly on to the engine cover, which is not good.

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4. Briggs & Stratton 49T877-0004-G1

Briggs & Stratton 49T877-0004-G1

Are you in search of a top-notch engine for your lawn mower for commercial use? Here is one of the best lawnmower engines by Briggs & Stratton from their Commercial Turf Series. This engine falls on the higher end of the price spectrum, but it is definitely worth the money.

This lawnmower engine is a fantastic commercial-grade option for OMEM and replacement use. Ultimate debris protection is provided by the unique five-step Debris Management System patented by Briggs & Stratton.

So your engine will not give up under extreme debris conditions. This engine comes with cyclonic air filters and not panel-style air filter systems. This difference makes it two times more efficient when it comes to debris protection.

Are you going to be putting your machine through some harsh mowing conditions and worried about the engine overheating? Worry no more! Because the Overhead Valve design of this engine, along with its cast-iron sleeves, makes sure that the cooling operation is running correctly. Its high-quality cylinder block structure ensures the durability and strength of this product.

The charging system is a 16 amp alternator with a regulator on the cylinder. The engine has a heavy flywheel and a twin-cylinder. The starting system is 12V heavy-duty starter. The lubrication of the engine components is controlled by the spin-on oil filter that works on full pressure.

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5. Briggs & Stratton 25 HP

Briggs & Stratton 25 HP

So you have a zero-turn mower, and you are looking for the right engine for it. If that is the case, then this Briggs & Stratton 25 HP powerful engine will win your heart in seconds. In a 700-dollar price range, you are offered a high-power and high-quality engine by the most trusted brand out there.

This engine is 724cc and belongs to the Commercial Turf Series of Briggs & Stratton. This engine model, 44T977-0015, is one with a vertical shaft. This engine has been designed for mowers or machines carrying out high-debris applications. It works as a great z-turn replacement engine for riding mowers.

This product has got a 5-stage cyclonic system for air filtration, which is impeccably designed. The customers have been pleased with the way this engine fits and doesn’t cause installation difficulties.

It has been observed that it bolts right on, and the entire wire harness can be easily plugged in without making any modifications. It is excellent for people who like to do their engine replacement by themselves.

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6. Briggs And Stratton Vertical 17.5

Briggs And Stratton Vertical 17.5

This is another highly affordable engine by Briggs & Stratton if you’re not willing to spend much. This 500cc engine from their INTEK series is designed for riding mowers that have manual deck engagement.

In less than 500 dollars, you get a branded engine with 17.5 HP. What can be better than that? This engine comes with a 3amp alternator for charging the battery. It, however, does not come with a fuel pump and will require a gravity-feed fuel supply. So you might want to look into that before buying it.

This 31R977-0043 model is sure to last long with its Dura-Bore cast iron cylinder. This also comes with an impressive warranty for both commercial, as well as consumer use. The maintenance-free Magnetron ignition is a bonus with this engine.

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7. Briggs & Stratton Vertical Engine 7.25

Briggs & Stratton Vertical Engine 7.25

This is the cheapest engine on our list of reviewed engines. But this doesn’t mean that it lacks quality in any way. This is Briggs & Stratton’s vertical style engine, which is available for less than 200 dollars. This engine has a torque power of 7.25 and is 190cc.

If you have a push mower and you’re looking for a trustworthy replacement engine for it, then this one is going to be a great fit. This is also a universal replacement engine for rotary mowers of various brands. This comes with a consumer and commercial warranty, which is always a good thing.

Many happy customers have mentioned that this is an excellent engine, given its price. They also reviewed it by saying that this engine starts on the very first pull and is pretty gas efficient. That saves you even more money.

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8. Kawasaki FJ180V-BM09 Engine

Kawasaki FJ180V-BM09 Engine

Kawasaki is another fabulous brand when it comes to lawnmower engines and other power products. This is a commercial replacement engine that can be bought for less than 500 dollars.

Have you been searching for a replacement for your FJ180V-BM09 and couldn’t find the right one? Well, this is the right one. It will not only replace your FJ180V-BM09, but it will also replace various FJ180V models.

Customers have been delighted with their purchase of this engine. It has been noted that this engine fits perfectly in the commercial push mowers.

You might have to transfer the fuel line, the choke lever, and the gas tank from your original engine. The customers have recommended that you attach the gas tank to the new engine before you mount it.

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9. Kohler KT715-3047 7000 Series

Kohler KT715-3047 7000 Series

Kohler 7000 Series engine is a high-power engine that works as a replacement for riding mowers and residential zero turns. This is a 725cc engine with an amazingly high power rating of 20 HP.

This engine by Kohler has a PRO Performance filtration system that enhances the filtration of air, fuel, and oil. The critical components of the engine are kept well-lubricated by the pressure lubrication package. This, in turn, extends the life of the engine.

Do you live in a freezing area and thinking if the engine would even start? Think no more, because this engine starts even at temperatures that are below freezing.

The Smart-Choke technology allows the engine to start at any throttle position. So you won’t need to choke the engine at all. The engine speed is kept consistent with Consistent-Cut technology.

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Frequently Asked Questions

1. How To Store The Lawnmower Engine?

If you are looking to store your lawnmower engine, that means you are not going to be using it for a while. So, the first step is to drain the engine out of fuel.

If that’s not a possibility for you, then add a stabilizer and let it run until the fuel gets used up in the carburetor. After that, change the oil after your last use while the engine is still hot. The final step is to put about a tsp of oil in the hole of the spark plug.

2. How To Increase The Lifespan Of The Engine?

The most important thing you can do to increase the lifespan of your engine is to keep it clean so that it can cool better. The next thing is to change oil at regular intervals before it turns carbon black.

Inspecting and replacing the filter will prevent the restriction of the flow of air. Not allowing the dirt to get past it will make your engine live long. It is not advisable to wash the paper air filters with gas for reuse. Just replace them.

3. Is It Safe To Use Additives In The Engine?

Frequent addition of cleaners or additives to the oil is not recommended. Additives that are made for automotive purposes are less likely to perform properly at high temperatures. Oil additives are also known to break down prematurely, which then alters the oil properties.

This can lead to engine damage caused internally. The damage is also done by the tendency of oil additives to separate and turn acidic. If you are looking for something to use when not using the engine, go for fuel stabilizers instead of additives or cleaners. Fuel stabilizers will retard the deterioration of the oil in a better way.

4. Which Fuel Should Be Used In A Lawnmower Engine?

You can either use gasoline or diesel in your engine. If you are going for gas, you should prefer regular unleaded gasoline that has an octane rating of 87 or more. If your engine needs oxygenated fuel, then you can go for mixtures that have no more than 10% ethanol or 15% MTBE. Don’t go for blends with higher amounts of methanol.

As for diesel, you should use the same type of diesel that’s used in the cars. Other types of fuel can damage your engine. You should avoid using mixtures of fuel and water or dirty diesel fuel. Such practices can cause detrimental engine defects.

Lawn Mower Engine Maintenance

Maintaining outdoor power equipment isn’t something that you should be ignorant about. The lawnmower engines stay shut during winters, and they must be prepped before they are set out to work in the spring. Here are a few basic things you can do to prep your mower engine to avoid any hiccups for when the grass grows back.

1. Oil Change

It is recommended that you change the mower engine oil at least twice every year. This is because oil is prone to gathering dust and debris, which can harm your engine internally. Also, using the engine regularly makes the oil break down due to heat. So changing the oil will prevent all this damage to your engine if done regularly.

To change the oil, you can use an oil-removal pump that is readily available through engine dealers. It is always advised that you add the fresh oil as per the instructions are given in your engine’s operator’s manual. And also make sure that you are recycling the oil properly.

2. Air Filter Replacement

The ambient air of a lawnmower engine is full of dirt, which gets collected in the air filter of the engine. If allowed to sit there for long, these pollutants can infiltrate the insides of the engine, causing it harm.

Therefore, the air filter should be replaced either every 3-4 months or after using the mower for 25 hours. This begs the question of the right air filter for your engine. For this, you should consider referring to the operator’s manual of the product.

3. Spark Plug Replacement

Has your mower been giving you a hard time when you try to start it? It might be the spark plug acting up as old spark plugs do cause issues. The rule with spark plugs is that you should change them at the beginning of every mowing season.

You can also change them after you’ve used the engine for 100 hours, which won’t happen as quickly if you use your machine infrequently. This ensures a smooth start to the mower and keeps you from getting frustrated every time you use it.

4. Fresh Fuel

If you are new to the mower equipment use, you should know that gasoline goes stale in around 30 days. This stale fuel leads to gummed-up internal parts of the engine. This happens more if you are using ethanol-blended fuels because it attracts moisture.

This moisture then gets separated from the fuel and makes your engine components prone to corrosion. The damage caused by the corrosion reduces the overall performance of the machine.

To avoid all of this mess, you have to treat your fuel every time you fill-up the gas can. You can get fuel stabilizers that defend the engine against all these damaging effects of ethanol. The addition of these stabilizers keeps your fuel fresh for around three years. And who doesn’t like the fuel that stays fresh for years?

Best Lawn Mower Engine – What’s Your Pick?

Lawn Mower engine replacement is a standard procedure. One can replace their lawnmower’s engine at home as well. The tricky part is to find the right replacement engine for the old one. There are a lot of factors you need to take into account before making this decision.

That’s because buying an engine for your lawnmower is an essential and long-term investment. So, go through our guide on lawnmower engines to find out who makes the best lawnmower engine and how to choose the right fit for your machine.