What Is the Gap for A Stihl Chainsaw Spark Plug?

What Is the Gap for A Stihl Chainsaw Spark Plug?

Maintaining a Stihl chainsaw is crucial for its performance, efficiency, and longevity. One essential aspect of this maintenance is ensuring the proper gap setting for the spark plugs.

In this article, we’ll discuss the importance of gap setting, the tools required, and a step-by-step guide to adjusting the gap on your Stihl chainsaw spark plugs. We’ll also address common mistakes and maintenance tips for optimal performance.

The correct setting for a Stihl chainsaw spark plug is 0.020 inches (0.5 mm). This small but critical gap ensures that the spark plug fires correctly, allowing for efficient combustion and optimal engine performance.

Neglecting to maintain the appropriate spark plug gap in your Stihl chainsaw could lead to various issues, from reduced power to engine damage. Therefore, it is vital to follow the manufacturer’s guidelines and regularly check and adjust the spark plug gap as needed.

Tools Needed for Gap Setting

To adjust the gap on your Stihl chainsaw spark plugs, you’ll need the following tools:

  1. Spark plug gap tool: This simple device measures the gap between the electrodes and helps you adjust it accurately. AVAILABLE HERE ON AMAZON
  2. Spark plug wrench: A specialized wrench designed to remove and install spark plugs without damaging them. AVAILABLE HERE ON AMAZON

Why Spark Plug Gap Setting Matters

What Is the Gap for A Stihl Chainsaw Spark Plug? - Stihl Spark Plug Air Gap

The gap between the center and ground electrode of the spark plug is critical for efficient combustion within your chainsaw’s engine. An incorrect gap can lead to poor fuel consumption, reduced power, and even engine damage. Proper gap setting ensures a strong spark for efficient combustion, which translates into better performance and a longer-lasting chainsaw.

Proper Gap Setting for Stihl Chainsaw Spark Plugs

Before you begin, it’s essential to know the proper gap setting for your specific Stihl chainsaw model.

Stihl Chainsaw Spark Plug Specifications

Generally, Stihl chainsaws require a spark plug gap of 0.020 inches. However, consult your chainsaw’s owner manual to confirm the correct gap setting for your specific model.

How to Measure Spark Plug Gap

Using a spark plug gap tool, slide the tool between the center and ground electrode. The tool will indicate the current gap measurement. Compare this to the recommended gap setting in your owner’s manual.

Step-by-Step Guide to Adjusting the Gap

What Is the Gap for A Stihl Chainsaw Spark Plug? - Stihl Spark Plug Air Gap

Follow these steps to adjust the gap on your Stihl chainsaw spark plug:

  1. Remove the spark plug: Disconnect the spark plug wire and use the spark plug wrench to remove the plug.
  2. Measure the gap: Use the gap tool to measure the current gap between the electrodes.
  3. Adjust the gap: If the gap is incorrect, gently bend the ground electrode using the gap tool until the proper measurement is achieved.
  4. Reinstall the spark plug: Use the spark plug wrench to reinstall the plug, and then reconnect the spark plug wire.

Common Gap-Setting Mistakes and How to Avoid Them

Here are some common mistakes people make when adjusting the spark plug gap and tips for avoiding them:

Overbending the ground electrode: Bend the ground electrode gently to avoid damaging it. Apply minimal force to prevent breaking or weakening the metal.

  • Relying on “eyeballing” the gap: Always use a spark plug gap tool for accurate measurements. Guessing the gap can lead to poor engine performance.
  • Incorrect torque when reinstalling the plug: Over-tightening can damage the spark plug or the engine. Consult your owner’s manual for the proper torque specifications, and use a torque wrench if necessary.

Maintaining Your Stihl Chainsaw Spark Plugs

What Is the Gap for A Stihl Chainsaw Spark Plug? - Stihl Spark Plug Terminal End

Regular maintenance of your spark plugs is crucial for optimal chainsaw performance. Keep these maintenance tips in mind:

  • Clean the spark plug regularly: Remove any dirt or debris from the plug using a soft wire brush and solvent.
  • Inspect the electrodes: Look for any signs of wear, such as erosion or damage, which might indicate the need for replacement.
  • Check the gap setting periodically: Even properly installed spark plugs can shift over time. Regularly verify the gap setting and adjust as needed.

When to Replace Your Spark Plugs

Although maintaining your spark plugs can extend their life, they will eventually need replacement. Generally, you should replace your spark plugs after 100 hours of use or annually, whichever comes first. However, this may vary depending on your chainsaw model and usage. Signs that it’s time to replace your spark plugs include difficulty starting, poor engine performance, or increased fuel consumption.

Wrapping Up

Proper gap setting for Stihl chainsaw spark plugs is an essential aspect of chainsaw maintenance. Ensuring the correct gap setting, regularly maintaining your spark plugs, and knowing when to replace them will improve your chainsaw’s performance, efficiency, and lifespan.

By following the guidelines and tips provided in this article, you’ll keep your Stihl chainsaw in excellent working condition.

Have a safe and great day out there with your Stihl chainsaw.

Steven R.


What Is the Gap for A Stihl Chainsaw Spark Plug? - FAQs

Can I use any spark plug for my Stihl chainsaw?

No, it’s essential to use the specific spark plug recommended by Stihl for your chainsaw model. Using an incorrect spark plug can cause engine damage.

Why is my chainsaw hard to start even after adjusting the spark plug gap?

Other factors, such as a dirty air filter, old fuel, or a worn-out starter rope, might be causing the issue. Inspect these components and address any problems you find.

How do I know if my spark plug is damaged?

A damaged spark plug might have a cracked insulator, damaged threads, or visibly damaged electrodes. If you suspect your spark plug is damaged, replace it immediately.

Can I use a feeler gauge to measure the spark plug gap?

Yes, a feeler gauge is another tool that can be used to measure the gap accurately. However, a spark plug gap tool is generally more convenient and easier to use.

Should I apply anti-seize compound to the spark plug threads?

While some people recommend applying anti-seize compound to the threads, Stihl advises against it. The compound can cause over-tightening and potentially damage the engine. Instead, ensure the threads are clean and dry before installation.

Steven R

I have been part of the chainsaw and outdoor power equipment business in one way or the other for over 35 years. There are not many things that I have not seen in the business. From repairs, sales, equipment operation, and safety I can help you with your questions.

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