What Type Of Spark Plug Does My Snowblower Need?

So, you’ve just purchased a brand new snowblower, and now you’re faced with the daunting task of figuring out what type of spark plug it needs. With so many options available on the market, it can be overwhelming to determine the correct one for your specific machine. Don’t worry, though, because in this article, we’ll break down the factors you need to consider when choosing a spark plug for your snowblower. From the size and heat range to the electrode material, we’ve got you covered. So, let’s cut through the confusion and ensure your snowblower keeps running smoothly all winter long.

Why is the spark plug important in a snowblower?

Ignition system overview

The ignition system is a crucial component of a snowblower, as it is responsible for starting the engine and generating the spark needed to ignite the fuel-air mixture. The spark plug plays a vital role in this process by creating the electrical discharge required for combustion to occur. Without a functioning spark plug, the engine would fail to start or run poorly, resulting in inefficient performance, decreased power, and potential damage to other engine components.

The role of the spark plug

The spark plug is a small but critical part of the ignition system in a snowblower. Its primary role is to deliver an electric current from the ignition coil to the combustion chamber, where it ignites the fuel-air mixture. When the spark plug receives the electrical charge, it creates a spark across the gap between its electrodes. This spark ignites the compressed mixture, initiating the combustion process and producing the power needed to operate the snowblower.

Signs of a faulty spark plug

A faulty spark plug can lead to several noticeable symptoms in a snowblower. If you experience difficulty starting the engine, such as multiple attempts or a slow cranking speed, it may indicate a problem with the spark plug. Misfiring or irregular engine operation, including rough idling or poor acceleration, can also be attributed to a faulty spark plug. Additionally, decreased fuel efficiency, increased exhaust emissions, and engine stalling are commonly associated with a spark plug that needs to be replaced. It is important to address these signs promptly to ensure optimal snowblower performance.

Understanding spark plug basics

Composition of a spark plug

Spark plugs consist of several key components, including the center electrode, ground electrode, insulator, shell, and metal housing. The center electrode, made of a durable conductive material such as copper or platinum, extends into the combustion chamber to create the spark. The ground electrode, typically positioned at an angle to expose it to the fuel-air mixture, helps guide the spark and facilitate combustion. The insulator surrounds the center electrode and provides electrical insulation. The shell, often made of steel, connects the spark plug to the engine. Finally, the metal housing protects the internal components and ensures proper heat dissipation.

Heat range

The heat range of a spark plug refers to its ability to dissipate heat generated during combustion. It is a crucial factor in determining the spark plug’s performance and longevity. The heat range is determined by the length and thickness of the insulator, as well as the materials used. A hot spark plug has a longer insulator and transfers less heat from the combustion chamber to the spark plug body. In contrast, a cold spark plug has a shorter insulator and dissipates more heat. It is essential to select the appropriate heat range for your snowblower to prevent overheating or fouling of the spark plug.

Gap size

The gap size of a spark plug refers to the distance between the center electrode and the ground electrode. It plays a critical role in determining the spark plug’s performance and the efficiency of combustion. The ideal gap size for a snowblower spark plug is typically specified by the manufacturer and can vary depending on the engine’s design and specifications. A gap that is too wide can cause misfires and poor combustion, while a gap that is too narrow can lead to difficulty in ignition or increased wear on the spark plug. It is important to check and adjust the gap size when replacing a spark plug.

Thread size

The thread size of a spark plug refers to the diameter and pitch of the threads on the spark plug’s shell. It is essential to ensure that the new spark plug has the correct thread size and is compatible with your snowblower’s engine. Using the wrong thread size can result in improper installation, which may lead to damage to the spark plug or the engine itself. It is crucial to consult the snowblower’s manual or seek professional advice to determine the appropriate thread size for your specific snowblower model.

Types of spark plugs for snowblowers

Standard spark plugs

Standard spark plugs, also known as non-resistor spark plugs, are the most basic and commonly used type. They provide a reliable and cost-effective option for most snowblowers. Standard spark plugs typically have a solid copper core, which offers excellent heat dissipation and reliable ignition. However, they may be more prone to fouling and may not provide long-term durability compared to other spark plug types.

Resistor spark plugs

Resistor spark plugs, as the name suggests, contain a built-in resistor that reduces electrical noise and interference. This makes them suitable for use in snowblowers with electronic ignition systems. The resistor helps prevent radio frequency interference that can interfere with modern electronic components. Resistor spark plugs are generally designed to be more durable and resistant to fouling than standard spark plugs, making them a suitable choice for snowblowers that require reliable performance in various conditions.

Platinum spark plugs

Platinum spark plugs feature a platinum center electrode, which provides several advantages over traditional copper or nickel alloy electrodes. Platinum is more resistant to wear and corrosion, offering improved longevity and consistent performance. These spark plugs tend to have a longer lifespan and provide more efficient combustion, resulting in better fuel economy and reduced emissions. While platinum spark plugs may be more expensive than standard or resistor spark plugs, they can be a worthwhile investment for individuals seeking enhanced snowblower performance.

Iridium spark plugs

Iridium spark plugs are renowned for their exceptional durability, longevity, and high performance. They feature a center electrode made of iridium, which has a higher melting point and is extremely resistant to erosion. Iridium spark plugs offer superior ignitability and reduce the likelihood of misfires, resulting in smoother engine operation and improved overall efficiency. While they are typically the most expensive of the spark plug types, iridium spark plugs are favored by those who prioritize longevity and optimal performance in their snowblower.

Choosing the right spark plug for your snowblower

Manufacturer’s recommendations

To ensure optimal performance and longevity of your snowblower, it is advisable to consult the manufacturer’s recommendations for spark plug selection. The manufacturer’s specifications will typically indicate the specific spark plug type, heat range, gap size, and thread size suitable for your snowblower model. Following these recommendations will help ensure compatibility and enable the spark plug to perform optimally under the intended operating conditions.

Consulting the snowblower’s manual

The snowblower’s manual is a valuable resource when it comes to selecting the right spark plug. It often contains detailed information about the spark plug requirements, including the specific type and specifications recommended by the manufacturer. The manual may also provide step-by-step instructions on spark plug replacement and maintenance, allowing you to properly care for and extend the lifespan of your snowblower’s spark plug.

Considering engine specifications

In certain cases, the engine specifications may influence the choice of spark plug for your snowblower. Engines with modified components, such as high-performance upgrades or alternative fuel systems, may require specific spark plug characteristics to optimize combustion and ensure reliable performance. If you have made modifications to your snowblower’s engine, it is essential to consult with a knowledgeable professional or refer to specialized resources to determine the most suitable spark plug for your specific setup.

Step-by-step guide to replacing snowblower spark plug

Gathering necessary tools

Before replacing the spark plug, gather the necessary tools. These typically include a socket wrench or spark plug socket, a spark plug gap gauge, and a wire brush or spark plug cleaner. It is essential to use the correct socket size to avoid damaging the spark plug or the engine.

Preparing the snowblower

Ensure that the snowblower is turned off and remove the ignition key to prevent accidental starting. Allow the engine to cool down if it has been recently in use to avoid the risk of burns. Locate the spark plug, which is typically positioned on the top or side of the engine cylinder.

Removing the old spark plug

Using a socket wrench or spark plug socket, loosen and remove the old spark plug by turning it counterclockwise. Take care not to damage the spark plug or drop any debris into the spark plug well. Inspect the old spark plug for signs of fouling, such as carbon deposits or worn electrodes, which may indicate performance issues.

Inspecting and cleaning

Examine the new spark plug to ensure it matches the manufacturer’s specifications and is free of any visible defects. With the spark plug gap gauge, check the gap size between the center electrode and the ground electrode. Adjust the gap if necessary using the appropriate tool. Cleaning the spark plug threads with a wire brush or spark plug cleaner can help remove any dirt or debris that may affect the installation.

Installing the new spark plug

Carefully thread the new spark plug into the spark plug well by hand, ensuring it is aligned correctly. Use the socket wrench or spark plug socket to tighten the spark plug snugly, but avoid over-tightening, which can cause damage. Reinstall any protective covers or components that were removed during the process. Finally, reconnect the spark plug wire to the spark plug, ensuring a secure connection.

Maintenance tips for snowblower spark plugs

Regular inspection and cleaning

To maintain optimal performance, it is important to regularly inspect and clean the spark plug. Periodically remove the spark plug and visually inspect it for any signs of fouling or damage. Use a wire brush or spark plug cleaner to gently remove any deposits or debris that may have accumulated on the electrodes. Proper cleaning helps ensure reliable ignition and extends the life of the spark plug.

Replacing spark plugs

While spark plugs are designed to be durable, they will eventually wear out and require replacement. The frequency of spark plug replacement will vary depending on factors such as the snowblower’s usage, operating conditions, and the type of spark plug used. As a general guideline, it is recommended to replace the spark plug every one to two years or as specified by the manufacturer. Regularly inspecting the spark plug can help determine if replacement is necessary.

Using an anti-seize compound

When installing a new spark plug, applying a small amount of anti-seize compound to the spark plug’s threads can help prevent seizing or sticking. The anti-seize compound acts as a lubricant and prevents the spark plug from becoming stuck in the engine. This can be particularly beneficial when replacing spark plugs in older snowblowers or in areas with harsh environmental conditions.

Avoiding over-tightening

When installing a spark plug, it is important to avoid over-tightening. Over-tightening can cause damage to the spark plug or the engine’s threads, potentially leading to costly repairs. Follow the manufacturer’s recommended torque specifications or tighten the spark plug snugly by hand, ensuring it is securely in place without excessive force.

Frequently asked questions about snowblower spark plugs

How often should I replace the spark plug?

The frequency of spark plug replacement depends on various factors such as the snowblower’s usage, operating conditions, and the type of spark plug used. As a general guideline, it is recommended to replace the spark plug every one to two years or as specified by the manufacturer. However, it is important to regularly inspect the spark plug and replace it if signs of fouling, wear, or damage are apparent.

What happens if I use the wrong spark plug?

Using the wrong spark plug can result in poor engine performance, difficulty starting, misfires, increased fuel consumption, or even engine damage. Each snowblower is designed to work optimally with specific spark plug characteristics, including heat range, gap size, and thread size. It is crucial to consult the manufacturer’s recommendations or the snowblower manual to ensure the correct spark plug is selected and installed for your specific snowblower model.

Can I clean and reuse a spark plug?

It is possible to clean a spark plug and reuse it under certain conditions. If the spark plug is only lightly fouled or has minimal wear, cleaning the electrodes with a wire brush or spark plug cleaner can restore its performance. However, heavily fouled or damaged spark plugs may not be salvaged through cleaning alone and should be replaced. Regular inspection and cleaning can help determine if a spark plug is suitable for reuse.

Can colder spark plugs improve performance?

In certain cases, using colder spark plugs may improve engine performance, especially in high-performance or modified snowblowers. Colder spark plugs have a shorter insulator, allowing them to dissipate heat more effectively. This can help prevent pre-ignition and detonation in engines operating under extreme conditions, such as high RPM or increased compression. However, it is important to consult with a knowledgeable professional or refer to specialized resources when considering the use of colder spark plugs, as their suitability depends on the specific snowblower setup and intended use.


The spark plug plays a vital role in the ignition system of a snowblower, ensuring that the engine starts and operates efficiently. Understanding the basics of spark plug composition, heat range, gap size, and thread size is important in selecting the right spark plug for your snowblower. Following manufacturer recommendations, consulting the snowblower manual, and considering engine specifications are essential steps in choosing the most suitable spark plug. By maintaining and replacing spark plugs when necessary, you can ensure optimal snowblower performance and prolong the lifespan of your machine.