How To Choose The Right Spark Plug For My Generator
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How To Choose The Right Spark Plug For My Generator?

You’ve come to the right spot if you want to change the spark plugs in your generator but need guidance on where to begin. This post contains all the required knowledge to select the ideal spark plug for your generator. We will advise what to consider when choosing, including reviewing your Owner’s Handbook for particular suggestions.

Read Also: Top Rated Must Have Generator Accessories

How To Choose The Right Spark Plug For Generator?

Regarding generators, spark plugs are crucial in starting the engine and ensuring it runs smoothly. Spark plugs can wear out over time, so choosing the right one to replace the old one is essential. Here are some factors to consider when choosing a spark plug for generators:

Check The Owner’s Manual

Checking the owner’s manual is the first step when selecting a spark plug for your generator. Follow the manufacturer’s recommendations to ensure optimal performance and prevent any potential damage to your generator.

Many popular generator brands and models, such as Honda EU2200i and Yamaha EF2000iS, have specific guides for spark plugs listed in their owner’s manuals. These guides provide the recommended spark plug type, gap size, and torque values.

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In addition, many manufacturers make their owner’s manuals available for download on their websites. For example, on their websites, you can find owner’s manuals for popular generators like the Honda EU2200i and Yamaha EF2000iS.

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You can ensure your generator operates smoothly and efficiently by referring to the owner’s manual and using the recommended spark plug type and specifications.

Follow The Recommendations

Following the owner’s manual recommendations is crucial when selecting a spark plug for your generator. The manufacturer’s recommendations consider the generator’s specific requirements and performance characteristics. Deviating from these recommendations could lead to reduced performance, damage to the engine, and even the generator’s warranty being voided.

For example, if you have a Honda generator, the owner’s manual will specify the compatible spark plug for your specific model. Honda recommends using NGK spark plugs for their generators, such as the NGK BPR6ES or the NGK BPR5ES, depending on the model. Similarly, Generac generators often require a specific brand and model of the spark plug, such as the NGK BPR4ES.

By following the manufacturer’s recommendations for compatible spark plugs, you can ensure that your generator operates at peak performance and avoid any potential damage to the engine.

Mind The Required Gap

Spark Plug Electrode Gap
How To Choose The Right Spark Plug For My Generator? 1

When selecting a spark plug for your generator, paying attention to the gap size is essential. The space between the (curved electrode and the other one at the tip of a plug) on the spark plug is called the “gap size.” If the gap is too small, the spark may not be strong enough to ignite the fuel-air mixture, and if it’s too large, the spark may not be able to jump across the gap.

The following are the most typical generator spark electrode specifications:

  • Gap: 0.028″ to 0.031″ (0.7 mm – 0.8 mm)
  • Size of the socket: 5/8″ (16mm) or 13/16″ (21mm)

Our research shows that most portable generators require spark plugs with a spacing measurement of 0.028′′ to 0.031′′. (0.7 mm – 0.8 mm). Remember that your particular generator’s spark electrode spacing might be different.

You will require a wrench and ratchet that suit the spark plug to change it. Ensure you have the correct size before attempting to replace the plug.

Go For Quality, Not Price

When selecting a spark plug for your generator, it’s essential to keep quality high at the expense of a lower price. High-quality spark plugs will perform better and last longer, reducing the risk of breakdowns and the need for frequent replacements.

Some reliable brands for spark plugs include NGK, Champion, and Bosch. These brands have a reputation for producing high-quality products that can withstand the harsh conditions of a generator’s engine. While their products may be slightly more expensive than some lesser-known brands, investing in a quality spark plug can save you money in the long run by reducing the need for frequent replacements.

Ask For Professional Help

If you are still determining which spark plug to choose for your generator, it’s always a good idea to seek expert help. You can ask your generator’s local distributor or retailer for advice. They can explain which spark plug suits your generator’s model and make.

Choosing the correct spark plug for your generator ensures it performs optimally and lasts longer. The wrong spark plug can cause severe damage to your generator’s engine and may even void its warranty.

By asking for professional help, you can be sure that you are making an informed decision and choosing the correct spark plug for your generator. Don’t hesitate to inquire if you need guidance selecting a spark plug.

Engine Size And Type

When selecting a spark plug for your generator, it’s essential to consider the engine size and type. Usually, the owner’s handbook contains this information. Spark plugs come in different heat ranges, determining how quickly the plug can transfer heat away from the combustion chamber. Using the wrong heat range can result in poor engine performance, premature wear, or even engine damage.

For example, a generator with a small engine size, such as 1000–2000 watts, may require a spark plug with a colder heat range to prevent fouling. On the other hand, a generator with a larger engine size, such as 5000–7500 watts, may require a spark plug with a hotter heat range to prevent detonation.

Additionally, some generators may have specific engine types, such as OHV (overhead valve) or OHC (overhead cam). Choosing a spark plug compatible with the engine type is essential to ensure proper ignition and performance.

Operating Conditions

Different conditions, such as temperature, altitude, humidity, and fuel quality, can affect the performance of the spark plug. For example, a high-altitude location may require a different spark plug than a low-altitude location due to changes in air pressure. Similarly, extreme temperatures may require a different spark plug type to ensure proper ignition.

Thread Size

The thread size of a spark plug is also an important consideration when selecting a replacement. It refers to the diameter and pitch of the threads on the plug that screw into the engine’s cylinder head. Using a spark plug with the wrong thread size can damage the engine’s cylinder head and cause the plug to seize, making it difficult to remove.

To identify the proper thread size, consult the owner’s handbook or a dependable technician. Although other diameters are available, 14mm and 18mm are the most popular thread sizes for portable generators.

When purchasing a replacement spark plug, double-check the thread size to ensure it is compatible with your generator’s engine.

3 Best Spark Plug For Generator Guidance

Champion Copper Plus 71 Spark Plug (Carton of 1) – RC12YC

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A high-performing spark plug constructed to ISO and SAE specifications is the Champion Copper Plus 71 Spark Plug (Carton of 1), RC12YC. It provides better corrosion protection and precise temperature regulation for extended life. Better motor efficiency is guaranteed by the copper-core central electrode of this spark plug, which increases conductivity and regulates heat.

One of the unique features of this spark plug is the TinTac and Ultraseal shells, which eliminate the need for the use of an anti-seize compound during installation. This feature saves time and effort during installation and maintenance. The Champion Copper Plus 71 Spark Plug (Carton of 1) (RC12YC) also has good overall wear characteristics, ensuring durability and reliability.

The dimensions of this spark plug are 2.68 inches in length and 0.708 inches in diameter. It has a heat range of 12, which is ideal for most standard engines. The Champion Copper Plus 71 Spark Plug (Carton of 1) – RC12YC has 14 threads per inch, which makes it easy to install.

One of the best things about this spark plug is its compatibility with various engines. It can be used in automobiles, vehicles, and portable generator engines. The Champion Copper Plus 71 Spark Plug (Carton of 1)—RC12YC is also easy to install, and its firing order is 1-2-3-4-5-6-7-8-9-10-11-12.

The Champion Copper Plus 71 Spark Plug (Carton of 1), RC12YC, delivers consistent, long-lasting efficiency. Its copper-core center electrode ensures accurate heat range control, resulting in better engine performance and longer life. The TinTac and Ultraseal shells also offer superior corrosion resistance, making this spark plug suitable for harsh environments.

HIAORS F6TC Spark Plug For Honda GX140 GX160 GX200 5.5hp 6.5hp Engine Generator

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If you are looking for a spark plug replacement for your Honda GX140, GX160, or GX200 engine generator, the HIAORS F6TC Spark Plug is an excellent choice. It is designed to fit your engine perfectly and offers exceptional performance, fuel economy, and durability.

One of the best things about this spark plug is its high-quality construction. It is made of top-grade materials that ensure it can withstand the harsh conditions of your engine. As a result, it can last longer than many other spark plugs on the market, saving you time and money in the long run.

You don’t need specialized equipment or technical knowledge to install the HIAORS F6TC Spark Plug, which is also very simple. You can quickly replace your old spark plug with this one and be on your way to enjoying the better performance and fuel efficiency.

Another benefit of this spark plug is its excellent performance. It is built to provide the most force and torque possible while achieving outstanding fuel efficiency. As a result, you will have more power and save money on fuel. As a result, you will have more power and save money on fuel.

Honda 98056-55777 Spark Plug CR5HSB, 2 Pack

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Honda 98056-55777 Spark Plug CR5HSB—2 Pack perfectly replaces your car’s old or damaged spark plugs. This pack of two spark plugs is designed to provide excellent performance and reliability. The CR5HSB spark plugs are engineered to help your engine start quickly and efficiently while ensuring optimal performance.

One of car owners’ most common issues is difficulty starting their engines. Faulty or worn-out spark plugs are often the cause of this problem. With the Honda 98056-55777 Spark Plug CR5HSB—2 Pack, you can eliminate this issue and ensure your engine starts quickly and smoothly every time.

The Honda 98056-55777 Spark Plug CR5HSB—2 Pack has many features that make it an excellent choice for your car. The spark plug gap for this model is 0.7–0.8 mm, and the thread size is 10 mm. The reach of the spark plug is 12.7 mm, and the hex size is standard. Even if you’re not a professional, these characteristics make installing the spark plug simple.

One of the things we like about the Honda 98056-55777 Spark Plug CR5HSB—2 Pack is that it is a perfect replacement for the 98056-55757 spark plug. This means you can be sure it is compatible with your Honda and trust that it will provide optimal performance. The spark plug is also suitable for use in a range of other Honda engines, including BF2DX, BF2DY, EB2000I, EB2000IT1, EB2200IT, EU1000I, EU2000I, EU2000IK1, EU2000IT1, EU2200IT, EX700C, FG100, GX100, GX100RT, GX100T, GX100U, GX100UT, GX22, GX31, GXH50, GXH50U, GXH50UT, GXR120RT, GXR120UT, GXV50, GXV50U, GXV50UT, GXV57U, GXV57UT, HHE31C, HHT31S, UMK422, UMK422K1, UMK431, UMK431K1, WX10, WX15, and WX15T engines.

Buying Guide: Best Spark Plug For Your Generator

When you’re shopping for the best spark plug for your generator, there are a few key factors to consider. The right spark plug can make a significant difference in the performance and longevity of your generator, so it’s important to choose wisely. Here are some important things to keep in mind:


You should first consider the spark plug’s size. Different generators require different sizes, so it’s essential to make sure you get the right one. You can usually find the size information in your generator’s owner’s manual or by checking the old spark plug.


 The spark plug’s substance grade is also significant. Copper, platinum, and iridium are some of the most popular materials used in spark plugs. Copper is a good choice for everyday use, while platinum and iridium are more durable and perform better in certain situations.


The lifespan of a spark plug is another crucial factor to consider. You want to avoid replacing your spark plug too frequently, so look for a product designed to last a long time. Many manufacturers offer spark plugs with extended lifespans, which can save money and inconvenience you in the long run.


Finally, it’s worth considering the brand of the spark plug. Many reputable brands are on the market, such as Champion and NGK. Look for goods with favorable evaluations and a solid dependability and quality track record.

Benefits Of Having A Suitable Spark Plug For Your Generator

Increased Engine Efficiency And Performance

Upgrading to a higher-quality spark plug can increase engine efficiency and performance. Your generator will run smoother, and you’ll see a jump in power output thanks to less wasted energy in heat loss and electrical discharge.

Better Fuel Economy

 A suitable spark plug can also help improve fuel economy, as it ignites the fuel mixture more efficiently, resulting in less fuel waste and more power.

Enhanced Durability

High-quality spark plugs are made to last longer, meaning you won’t have to replace them as frequently. Long-term, this can save you both effort and money.

Improved Starting

A reliable spark plug can make starting your generator much easier, even in colder weather conditions. This is particularly useful if you live in an area with severe winters.

Cleaner Emissions

A suitable spark plug can also help reduce harmful emissions from your generator. Using your generator frequently can reduce your carbon footprint and improve air quality, which is especially important if you use it frequently.

Reduced Maintenance

By upgrading to a higher-quality spark plug, you can reduce your generator’s maintenance. In the long run, this can save you time and money and lessen maintenance outages.


  1. What size spark plug do I need for my generator?

    You can consult your generator’s manual or look up the information online. Most generators have a specific type and size of spark plug that the manufacturer recommends.

  2. What materials should I look for in a spark plug for my generator?

    Look for spark plugs of high-quality materials such as copper. This material are more durable and provide better performance over time.

  3. What is the lifespan of a spark plug for a generator?

    The lifespan of a spark plug varies depending on the manufacturer and the specific conditions under which the generator is used. Generally, high-quality spark plugs can last for thousands of hours before needing to be replaced.

  4. How do I determine the gap size for my generator’s spark plug?

    Consult your generator’s manual or look up the information online. The recommended gap size for the spark plug will vary depending on the make and model of your generator.

  5. Can I use any spark plug for my generator?

    No, it would help if you only used the spark plugs that the generator manufacturer recommends. Using the wrong type or size of a spark plug can cause damage to the generator and potentially be dangerous.


Choosing the proper spark plug for your generator ensures it runs effectively and consistently. Before purchasing, it is crucial to consider details like the spark plug’s size, composition, and lifetime. Choosing the right spark plug can enhance your generator’s efficiency and longevity. If you are still trying to decide which spark plug to use, read the manufacturer’s suggestions or ask a specialist for guidance. Using the proper ignition plug, you can use your generator for years without interruptions.

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