Best Motorcycle Spark Plugs: Change Your Spark Plugs Anywhere
Changing your own spark plugs is a great way to save money
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PUBLISHED ON November 7, 2019
Generally, spark plugs should be changed every 30,000 miles to ensure your bike starts. Proper spark plug installation and maintenance is an important part of maintaining your motorcycle’s top performance. Our choice spark plugs are made specifically for bikes. Read on for the best quality spark plugs on the market.
- Best OverallE3 Spark Plug PowersportsSummarySummary
The E3 spark plugs are widely popular among motorcyclists and are a step up from the standard spark plug. They come in a variety of sizes.ProsPros
Features a DiamondFIRE ground electrode configuration for faster ignition. The spark plug is also nickel-plated to last longer and protect against corrosion.ConsCons
This plug does not work well on motorcycles with large gaps. This spark plug works best with Harley-Davidson motorcycles.
- Best ValueDenso PK20TT Platinum Spark PlugSummarySummary
These Denso Platinum spark plugs feature a twin-tipped design, a platinum center electrode, and a titanium-enhanced alloy surrounding the ground electrode.ProsPros
These spark plugs come pre-gapped and are double-tipped. Paired with the precious metals surrounding the core, these plugs are meant to last up to and more than 60,000 miles.ConsCons
Depending on the bike, the material of these plugs may not be suitable for every type of motorcycle model.
- Honorable MentionNGK Iridium Spark PlugSummarySummary
These NGK iridium spark plugs come in a pack of two and a gap of .025 out of the box which can be further set and adjusted. Works great on Harley Davidson motorcycles.ProsPros
The bodies of these spark plugs are made from iridium, making ignition much faster and effective in comparison to spark plugs with copper bodies. The solid iridium core holds gases in place and allows for a more responsive engine.ConsCons
These spark plugs have high reactivity and fuel up too easily for carbureted bikes.
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Why Buy a Motorcycle Spark Plug?
- Improve your starting power. Without a healthy spark plug, your bike won’t achieve maximum starting power or may fail to start entirely. That’s because the gap of the spark plug may be too large and may not be able to spark electricity to ignite your motorcycle’s combustion system.
- Improve engine performance. A spark plug produces a sufficient amount of spark to burn the air-fuel mixture in the combustion system. Using a new and correctly gapped spark plug ensures that you prevent early ignitions or skipped firing, which can damage the engine.
- Replace your burnt spark plug. A burnt spark plug will have slight discoloration at the negative probe. If you measure the gap between the ground electrode and center electrode, you may notice that it’s a bit wider. If you don’t replace it, the probe will burn away and cause the engine to misfire.
- Keep the engine cool. A spark plug helps to transfer excess heat from the cylinder ignition chamber to the engine’s cooling system. If you have a healthy one, you won’t have to stop frequently during long trips to cool your engine.
- Improve fuel economy. A healthy spark plug helps your vehicle to maintain sufficient starting power, which in turn saves the amount of fuel the engine burns. Spark plugs also burn off contaminants and other deposits from fuel additives. That translates to fewer fuel emissions from your motorbike.
Types of Motorcycle Spark Plugs
Copper-tipped spark plugs are the most common and standard form of the spark plug. Copper is one of the best conductors of electricity, and for that reason, copper plugs do not overheat easily. That extends the life of the spark plug. They are typically inexpensive and can last for about 40,000 miles before they start to erode naturally.
Single platinum plugs are more expensive than copper despite the fact that they are less conductive than the latter. That’s because they tend to last longer since the metal does not erode or wear out as easily as copper. Platinum-tipped spark plugs can last for up to 100,000 miles but may experience slight overheating issues.
Double platinum spark plugs have double plates of platinum on the tip. They can, therefore, last longer and perform better than the single-platinum versions. They are also more expensive. However, they still experience overheating issues since the properties of platinum remain the same.
Iridium isn’t a great conductor of electricity, but that doesn’t compromise on its performance as a spark plug. In fact, iridium plugs can outlast the copper versions; they have a service life of about 60,000 miles. However, they are the most expensive of the four versions, since iridium is a harder metal to find.
Denso is a Japanese brand that’s been a leading supplier of automotive components since its inception in 1972. Denso products feature cutting-edge technology, and that’s why they come as OEM equipment on most General Motors, Honda, Toyota, Ford, Mercedes Benz, and Volvo equipment. Some of its best spark plugs for motorcycles are the Denso Platinum TT Spark Plug and the Denso Iridium Long Life Spark Plugs.
NGK is a Japan-based company that has more than 80 years of experience in making OEM and aftermarket accessories for the automotive and aviation industries. Some of its products include spark plugs, glow plugs, oxygen sensors, and ignition coils. If you want to try out a few NGK spark plugs, you can check out the NGK Iridium IX Spark Plugs and NGK G-Power Spark Plug.
E3 Spark Plugs
E3 Spark Plugs designs environmentally friendly spark plugs that offer a complete and cleaner fuel burn. It makes spark plugs for trucks, race cars, snowmobiles, ATVs, lawnmowers, and motorcycles. Some of the best spark plugs in its repertoire are the E3 Spark Plug Powersports and E3 Spark Plug Automotive.
ACDelco is a renowned manufacturer of automotive parts that’s a subsidiary company of General Motors. The company was founded in 1916 and is currently headquartered in Grand Blanc, Mich. If you would like to try out a high-quality, performance spark plug from the company, check out the ACDelco Professional Iridium Spark Plug.
Motorcycle Spark Plug Pricing
- $1-$20: Expect to find either copper- or nickel-tipped spark plugs within this price range. You can get a high-quality spark plug from a well-known brand that comes pre-gapped and has good corrosion resistance. Most can also resist pre-ignition.
- $20-$90: This price range consists of platinum, iridium, and heavy-duty copper spark plugs. Most also come pre-gapped and are well designed to resist electrode burnouts from excess heat combustion. You are less likely to experience engine misfires with a spark plug that’s higher on the price scale.
If you don’t know how to correctly gap a spark plug, prioritize spark plugs that come pre-gapped. The gap is the space between the tip (center electrode) and the curve (ground electrode). Correct gapping helps to prevent engine misfires and increase your bike’s fuel efficiency.
Ground Electrode Type
A spark plug can have two or more ground electrodes surrounding the central electrode. The ground electrode is the probe-like structure that protrudes from the threads. The most common type is a single and double electrode. More electrodes means that you can extend the life of the spark plug since you can rely on the second ground electrode when one burns out. However, it compromises the fuel efficiency of your vehicle.
The number of threads on the spark plug determines its level of reach into the combustion chamber. If the threads are few, you won’t get good combustion since the spark plug can’t project into the chamber. If there are too many, and the spark plug is longer than usual, it may get damaged by the pistons when the engine is running or the fuel will ignite sooner than expected. To get the right size, choose the one that’s the same size as your motorcycle’s original spark plug.
This is the speed at which the spark plug can transfer heat from the firing tip to the cooling system. It can be used to tell the amount of time that a spark plug can withstand heat combustion before it gets damaged. The heat range is typically displayed in numerical figures in your owner’s manual. Most motorcycle spark plugs have a heat range of 900 to 1,500 degrees Fahrenheit.
- Compatibility: Make sure that the spark plug is compatible with the make and model of your motorbike as well as the engine type. Also, consider the compatibility with your fuel.
- Functionality: Consider the features of the spark plug and how it can improve your engine’s performance. This is in regards to fuel economy, ignition time, and power efficiency.
Best Motorcycle Spark Plug Reviews & Recommendations 2019
Best Overall: NGK Iridium IX Spark Plugs
These NGK Iridium IX Spark Plugs are a set of genuine OEM spark plugs that come pre-gapped and threaded to fit in most Harley-Davidson motorcycles. They have an iridium tip, which means they can achieve fast and effective ignitions with consistent sparks. The iridium conduction tip is laser welded and can last for about 60,000 miles. They are designed to reduce voltage requirements and consequently prolong the life of your ignition system.
The spark plug has a unique long insulator nose to prevent fouling of the plug tip, engine misfires, and natural deterioration. It’s also 25 percent smaller than most platinum electrodes to help deliver up to 3 horsepower. The plugs are metal plated for advanced anti-corrosion and anti-wear properties. In addition, they can withstand extreme heat conditions and are, therefore, suitable for performance enthusiasts.
A downside to the NGK spark plug is that it’s highly reactive, and despite the long insulator nose, the plug tip still fouls up easily in carbureted bikes. It’s also more expensive than standard spark plugs.
Best Value: E3 Spark Plug Powersports
The E3 Spark Plug Powersports is designed to enhance the performance of your engine by providing a healthy power boost. It features a double DiamondFire ground electrode, which enhances the amount of combustion pressure that results from each power stroke of the engine. This translates to improved fuel economy, enhanced power output, reduced emissions, and faster starts.
Faster flame ignition by the dual ground electrode results in optimal combustion of the air and fuel mixture. This means that your bike will experience smoother acceleration and idle. It's also designed with colder heat ranges than your original spark plug, so it can handle intense conditions in the engine and allow for performance modification.
However, the spark plug may not be compatible with motorcycles whose factory spark plug has a large gap. Manually increasing the gap to fit the models could potentially reduce the efficiency of the double electrode. Despite that, it works well in gasoline-powered automobiles, snowmobiles, watercraft, trucks, lawnmowers, chainsaws, and most Harley-Davidsons.
Honorable Mention: Denso Platinum TT Spark Plugs
The Denso Platinum TT Spark Plug features cutting-edge technology for extended reliability and enhanced performance. It comes as a set of six spark plugs, each with twin-tip technology for optimal ignitability. They are manufactured with an advanced 360-degree, laser-welding process for utmost threading precision.
The spark plugs are designed with a titanium-platinum construction. The ground electrode is constructed with a titanium-enhanced alloy to minimize tip erosion and to extend the lifespan of the spark plug. The central electrode is made up of platinum for enhanced conductivity and superior spark performance.
However, this spark plug is not designed for every motorcycle. You need to confirm if it’s the right fit for your motorcycle’s make and model before fitting it. Also, you may need to regap them in less than a year.
- Measure the gap of your motorcycle to determine the size of the spark plug needed. Remember that spark plugs are not one-size-fits-all, and specific measurements are needed in order to make the best choice for your bike.
- Determine how many spark plugs you need. Most spark plugs come in packs. Once you find a brand that works for your bike, consider buying in bulk to save money.
- Evaluate how many times in the past you have changed your spark plugs. This will give you an estimate of how long the plugs are expected to last.
Q: Can I change my motorcycle spark plugs myself?
A: Yes. This will save you money in the long run and it is not very difficult to learn. Changing your own spark plugs ensures that your motorcycle maintains peak performance levels and allows you to maximize gas mileage. Changing your spark plugs requires the right tools, the right spark plugs, and a basic background and understanding of what the end goal is.
Q: How often should I change my motorcycle’s spark plugs?
A: This varies depending on how often you ride your bike, the distance you cover, and the age of your motorcycle. Regardless of your riding habits, it’s important to inspect your spark plugs on a regular basis.
Q: Does the material of the spark plug matter?
A: Spark plugs ignite sparks, and different metals do so at different levels. Spark plugs can have platinum cores, copper cores, and even be nickel-plated.
Our top pick for motorcycle spark plugs is the E3 Spark Plug Powersports. It comes in many sizes and is best suited for motorcycles.
A value pack for effective motorcycle spark plugs is the Denso Platinum Sparkplugs.