How to Test a Dirt Bike Coil in 5 Easy Steps

In this article, we will discuss how to test a dirt bike coil. This may seem like an easy task, but it can be more difficult than you think. Many factors could cause the coil to fail and need replacing. We will go through what these are and how you can avoid them, so you don’t have any problems with your dirt bike’s coils in the future!

How to Test a Dirt Bike Coil

Required Tools:

  • Multimeter
  • Wire cutters
  • Needle nose pliers
  • Soldering iron
  • Safety glasses or goggles

Procedures: How to Test a Dirt Bike Coil

Here are the step-by-step guide that how to test dirt bike coil. By follow these step you can easily do dirt bike coil test. So let’s start!

Step One:

Find the coil you need to test and disconnect it from the bike. There will be two wires connected to your spark plug wire; one is positive and goes into the ground on the frame of the bike, and another cable with a black and red wire that connects to the coil.

How to find and disconnect coil from bike

Step Two:

Set your multimeter on your voltage setting and attach one probe from it to a ground point on the bike frame, then set another probe into either of the wires coming out of the spark plug side of the coil (positive or negative). Readings should be in between 15- ohms setting. Next, attach the red and black wires to the leads on your multimeter, then attach those two probes to each other.

Step Three:

When you have the probe touching each other (the middle of a coil), it should read somewhere between 20-100 ohms depending on how old or worn out they are. If it is not in that range, then the coil needs to be replaced.

Step Four: 

If it is in that range, continue to scrape off the point where you connected the probes and traced back from there. If your reading goes up or down significantly as you go further into the coil, then one of two things are happening: either there’s a break at some point on the inside of the wire insulation coating (which would be visible), or the coil has actually broken.

Step Five:  

Something to keep in mind when testing dirt bike coils is that, depending on their age and how many miles they’ve been ridden, it can be difficult for them to produce an adequate spark because of increased resistance as more material builds up inside from all the metal filings generated by engine wear and tear.

Tips for Testing a Dirt Bike Coil:

Tips for Testing a Dirt Bike Coil

Tip 1: Establish and maintain good lighting when testing coils. This will help you identify any issues with your coil or connections more quickly, which can save you time in the end.  

Tip 2: Use safety gear such as gloves, goggles, and a work mat when you test a dirt bike coil.

Tip 3: Touch the top of the spark plug wires, and then touch them to the sides of the coils box. This will show if there are any short circuits in your system or not.

Tip 4: Dirt bike coils are a major part of electrical systems, so it is important to check them regularly and replace them as necessary for your safety and the performance of your dirt bike.

Tip 5: You should always have spare parts on hand in case you need to make an emergency repair while out riding or racing, such as dirt bike coils.

Precautions Before Testing Dirt bike Coil:

  1. You’ll want to use appropriate protective gear for your eyes and hands when you test a dirt bike coil.
  2. Make sure that the item is turned off before proceeding with testing.
  3. Check to see if the coil is grounded.
  4. Check for open connections on all cables that run from one end of the coil to another.
  5. Check that the spark plug wires are securely connected.
  6. Test each wire to see if it is grounding out as you move away from the coil in order to check for opens or shorts in your system.
  7. If there are any problems with ground connections on dirt bike coils, this could cause erratic firing of your engine, and it may cause harm.

FAQs About how to test a dirt bike coil

How can you avoid problems with your dirt bike’s coils?

There are many ways that a dirt bike’s coil could fail, but there are also many ways to prevent it from happening! Things such as keeping your bike clean and dry, not using it in extremely hot or cold temperatures, making sure the battery is fully charged before every use can all help.

How can you identify a faulty coil?

There are a few ways to identify a faulty coil:

  • Misfiring: One of the most common symptoms of a faulty coil is misfiring. If your engine is misfiring, it means that one or more cylinders are not firing properly. This can cause the engine to run rough, vibrate, and lose power.
  • Check engine light: If your check engine light is on, it could be a sign of a faulty coil. However, there are many other things that can cause the check engine light to come on, so it is important to have a diagnostic scan performed to determine the exact cause of the problem.
  • Fuel economy: If you are experiencing a sudden drop in fuel economy, it could be a sign of a faulty coil. A faulty coil can cause the engine to run less efficiently, which can lead to decreased fuel economy.
  • Visual inspection: If you are able to safely inspect the coils, you can look for any signs of damage, such as cracks, burns, or corrosion. If you see any damage, the coil is likely faulty and should be replaced.


You should now have a new appreciation for what goes into testing dirt bike coils and how you can use this information to help make your riding experience more enjoyable. 

We hope this article has given you some insight on how to test a dirt bike coil. If not, please feel free to contact us and provide feedback about your experience with the process or any difficulties that came up for you while testing it. Thank you so much for reading!

Darren Matlock

Darren Matlock

Hi, I'm Darren. I love dirt bikes and everything about the off-road lifestyle. I'm passionate about motorbikes, cars, racing sports and going on adventures. If you're like me and enjoy extreme sports, you've come to the right place! I like to write articles about dirt bikes to help beginners get started. Whether you're interested in buying a dirt bike, ATV, motorcycle or want to ride for hobby, I hope my articles will inspire you to learn more about how this machine can be used to ride.

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