Why Does Harley-Davidson’s Milwaukee-Eight Engine Have Four Spark Plugs?






As arguably the most recognizable motorcycle brand in the world, Harley-Davidson is consistently at the forefront of innovative engineering. It’s all about giving owners the most modern technology, resulting in a riding experience that’s both powerful and efficient. So when the company introduced the Milwaukee-Eight engine in 2016, it’s no surprise they did something new by installing four spark plugs instead of two.

The reason for this has to do with how the engine burns its air-fuel mixture during combustion. The engine has two cylinders, and two spark plugs per cylinder, which allows the air-fuel mixture to ignite more evenly. Because of the engine’s large V-twin design, a dual-spark plug setup makes the most sense. By using this configuration, Harley-Davidson could improve efficiency and emissions in the Milwaukee-Eight engine, while also supporting its strong output.

Overall, Harley’s Milwaukee-Eight engine was meant to be a broader modernization of their popular V-twin series. In addition to its dual spark plug design, the Milwaukee-Eight was engineered to deliver up to 11% more torque than Harley’s Twin Cam V-twin engine, which did have some big problems like oil leaks and timing chain issues. Additionally, the Milwaukee-Eight had faster acceleration, improved heat management, and a redesigned exhaust system in comparison to its predecessors. All of these features, combined with other internal upgrades, meant that the Milwaukee-Eight was a significant step forward from the engines Harley-Davidson used before.

Issues with the Milwaukee-Eight engine

Harley-Davidson’s Milwaukee-Eight engine is standard on many of the company’s motorcycles. This includes the Touring class, which has featured the engine since model year 2017. The Milwaukee-Eight has also powered Harley’s Softail bikes since 2018. There are three versions of the engine with different cubic inches available as of this writing: The 107, 114, and 117. If you’ve heard good things about the Milwaukee-Eight, and want to try it out for yourself, contact your local Harley-Davidson dealer.

But be aware that some owners have big problems with the Milwaukee-Eight 114 engine. A Harley-Davidson technical service bulletin, published through the National Highway Traffic Safety Administration (NHTSA), addressed an oil management condition in 2019 that affected certain 2017-2019 models. This condition, known as “sumping,” occurs when engine oil accumulates in the crankcase instead of being fully cycled back to the oil tank. According to the bulletin, the condition could result in loss of power and increased engine braking under certain operating conditions.

If you’re curious about whether or not a new or used Harley-Davidson you’re thinking of buying has this issue, you can visit the NHTSA’s website. Using the organization’s Recalls page, you enter the bike’s VIN or license plate number to get the information you need. You can also check the website for any service bulletins that may affect you; from there, you can make a more informed decision about what to do next.





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Michelin is a French multinational company that many consumers consider to be one of the most satisfying major tire brands. This firm makes several tire models that offer comfort, performance, all-terrain prowess, and everything in between — including cutting-edge products like the $42,000-per-set Michelin Pilot Sport PAX that it developed specifically for the Bugatti Veyron. Aside from its own tires, Michelin also owns other tire brands that you might be familiar with, including BFGoodrich, Achilles, and Corsa.

While tires are what Michelin is known for, the company has put its name to more than the rubber that wraps around your car’s rims. In fact, the company sells several other products that aren’t tires. So, we’re listing a few Michelin-branded items that you can buy online and in retail stores. While they might not all be made of rubber or even related to vehicles, these tools and accessories can come in handy when keeping your car — and even yourself — in good shape.

Michelin tire inflator

Since Michelin is primarily known for its tires, it makes sense for the company to sell a Michelin-branded tire inflator as well. That way, if you get a flat on one of the Michelin tires on your car or want to regularly top up your car’s tire pressure to maintain optimum performance, you can use a Michelin-branded pump to fill up your tires. The company actually sells several types of inflators on its Amazon page, but it only offers a single motorized unit — the Michelin Micro Tyre Inflator, which is available on Amazon for $98.99.

This little device is only slightly wider than an iPhone 17 and weighs about 400 grams, or 14 ounces. This means it’s easy to store in your car and to move to whichever tire needs topping up. More importantly, it takes power from a 12-volt socket, allowing you to run it using your car’s battery. It also has a USB port for charging your phone (or any other USB device) in case of an emergency.

Some users say that the device is slow, taking about 12 minutes to bring a tire from 10 to 32 PSI, but that’s not unexpected given its small size. Still, it should be good enough for regular weekly maintenance if you know your car’s proper tire pressure, or in case of an emergency. Its biggest downside is that you need a power source to run it, but having a dead battery and a flat tire simultaneously is likely a rare occurrence in many modern cars.

Michelin mini fridge

Taking a road trip during the summer can get you thirsty, and there’s no better way to quench that thirst than by drinking a cool can of soda (or your beverage of choice). If you want to ensure that you’ll always have a cold drink ready while you’re driving on the freeway, Michelin’s mini fridge will help you with that. This nifty little refrigerator is available on Amazon for just $99.99 and can be connected to either 110V AC or 12V DC power, ensuring that it will work on both your desk and in your car.

The mini fridge measures 6.9 x 9.45 x 10 inches (17.5 x 24 x 25.4 cm), meaning it can easily fit on a garage shelf or office desk. It should also be small enough to put on the floor of your car. Despite that relatively small size, it’s large enough to fit six 350-ml cans or four 500-ml bottles, and it will keep these items at a chilly 32 degrees Fahrenheit or 18 degrees Celsius. It also has an LED light on the door, so it can double as a night light if necessary.

Aside from keeping your drinks (and other food items) below room temperature, it also has a few other creature comforts. These include a removable shelf and door basket for flexibility and easy cleaning, as well as a retractable carry handle and a self-locking door to make transportation easier.

Michelin car floor mats

Heavy-duty car floor mats are often made from rubber for durability and water resistance, and since Michelin is in the business of rubber, it makes sense for the company to offer exactly that. So, if you want to protect your vehicle’s floor from dirt, dust, and mud, the company can help you with its Michelin all-weather car floor mats. This four-piece package is available on Amazon for $49.99 and comes in either black or tan.

The surface of these floor mats is specially designed to trap debris, snow, and water, preventing them from ruining the carpet on your vehicle. The mats have a cleat backing that grips your car’s floor and prevents them from slipping. The front row mats also come with what Michelin calls a Gripclip Retention System, allowing them to clip into your vehicle’s safety clips and adding even more reassurance that they won’t accidentally slip while you’re driving and pose a hazard to your safety.

These mats are universal and will work in most vehicles. However, they’re also easy to customize: If you find them a bit too large for the footwell of your tiny hatchback, you can use a pair of scissors to trim the edges for a perfect fit.

Michelin Stealth Ultra wiper blades

While Michelin’s Stealth Ultra wiper blades aren’t generally considered among the best windshield wipers, they appear to be a pretty good choice given their four-star rating on Amazon. These wipers cost $49.99 and are available in various size combinations for all sorts of cars. This ensures that no matter what vehicle you’re driving, you can probably find a set that will fit your needs.

These Michelin wipers are curved to conform to the shape of your windscreen for a clean, streak-free wipe. The company’s Amazon listing claims that these are designed to “withstand rain, wind, snow, mud, dust, or any other debris that might hamper your windshield’s visibility.” While you might think that windshield wipers are pretty simple items, and that you can just purchase any generic wipers off the internet, you must remember that they’re essential so that you have the best visibility possible during inclement weather. So, for your safety, consider investing in a set from a reputable brand like Michelin.

Michelin work boots

Michelin is known for making rubber tires to put on your car’s “feet,” but did you know it also makes shoes for the driver’s feet? The company makes sports & outdoor footwear, as well as shoes for work and safety. For this example, we have the Michelin HydroEdge Steel Toe waterproof work boot, listed for $210 on Amazon and at Georgia Boot. This shoe is available in U.S. sizes from 7.5 up to 14, ensuring that no matter what size you wear, you can get a Michelin work boot for yourself.

As the name suggests, this pair of shoes has steel toes to protect your feet from accidental impacts and is fully waterproof to help keep your feet dry, even in supposedly severe conditions. It also meets ASTM F2413 standards for electrical protection, meaning it has fully insulating soles to protect you from electrical hazards at work. Michelin also added what it calls an Advanced Rear Suspension system to its heel, ensuring proper shock absorption when you walk.





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