How to test a dirt bike stator (4 Best Way to Check the Stator)


Dear dirt bike lovers, are you faded up from having stator issues? Let me help you to test it with a proper guide. A stator is a set of wire coils that are connected to an engine.

To test a dirt bike stator is an easy process to avoid future issues and sort out the current problems. When you install a stator on your bike, testing it will be easier using a multimeter. Before going for any such tools, inspect with your naked eyes, wiring, thermal damages or breakdowns. A scale has been fixed for a good stator, if its battery is showing 12V or higher then it’s working. And the second common aspect to ensure is to use a multimeter to check the resistance of each tab, the result should always be less than 1 ohm. 

A rotating set of magnets or stator is placed over the stator and spins around the stator to produce electricity.  You should know what are the signs and causes behind the failure of the stator. Many times you just dial the number to the mechanic for electric issues, but it can be fixed with a few ideas and knowledge about the accurate measurements of internal circuits. 

Symptoms of a bad bike stator

The most common sign is that your bike will show no spark while starting or start running poorly. 

  • As a stator generates powers to start every electronic part. When it’s in a bad condition, it will be unable to help a spark plug to produce fire. And this would be a basic symptom of a bad stator. 
  • You may notice a very weak spark, when the stator fails to deliver sufficient power to the spark plug, it couldn’t fire the same as earlier. 
  • When you experience a bad stator, your dirt bike will start running slowly and at a certain point, it will fail. 
  • Another sign is you will point out it will be hard to start a bike with a bad stator. Like something is stuck between the engine and the Kickstarter indicating that the time has arisen to replace the old stator. 
  • Sometimes you may find misfiring while riding the bike. A stator doesn’t need to be always responsible for the same cause. 
  • If a high-speed coil in the stator is working badly it will show different kinds of symptoms. When you run your bike at lower rpm it will be fine but at higher rpm, it runs roughly. 
  • The bike starts backfiring, there could be many other reasons as well, but a bad stator is also a reason for backfiring. 

If you find any similar symptoms, you must check your bike stator. It can be adjusted but if the condition is worsening, then it needs to be replaced with the new stator. 

How to test a dirt bike stator?

You can test a stator either in an off position or running position. It has been classified into two different categories: one is static and the other is dynamic testing. 

  1. Dynamic Testing

In this testing, we measure AC voltage between phases. This result will lie between a range for different brands of dirt bikes. 

  • Set the multimeter at AC volts and start measuring between coils connecting the multimeter leads to the three terminals, between phase 1 & 2, phase 2 & 3 and phase 3 & 1. If the stator is good, no reading will be measured by the multimeter. 
  • Now turn on the engine, and follow the same step as above, measure the all three terminals. Positive reading can be seen in the multimeter, dictating that the stator is fine. 
  • Gradually increase the engine’s rpm, reading will be increased as well for all three terminals by following the same pattern. 

If there will be no change in the reading of the meter, it means the stator is out of service. 

  1. Static Testing

In this test a few steps are included, it’s about the measurement from coil to coil and phase to ground. This result could be different for various brands of dirt bikes. 

  • Set the multimeter at ohm and with its positive and negative poles check the stator, if it will show OL, that means the circuit is not grounded. And if it shows 0 that means the loop is closed now.
  • Now the next step is to do three measurements amongst three terminals in the stator circuit. Between phase 1 & 2, phase 2 & 3 and phase 3 & 1. Yamaha, Polaris or Honda stator will have a variety of results which will lie between 0.1 to 1 ohm, beyond this means something is messy. 
  • Connect one lead of the multimeter to the ground source and the other one will be connected to any of three terminals one by one. It should be OL for an open connection. 

Follow the above steps and test the dirt bike stator. 

  1. Voltage Testing

Check whether the battery is very low and doesn’t support the stator to work properly. Set the multimeter at DC voltage and measure the battery voltage across the posts. If it would be less than 12.5 Volt means required charging, install a battery charger. The next thing is to inquire about corrosion or any dust around posts or cable connections, clean it as soon as you can. Look at cables, and insulation to ensure no damage. At last round your eyes throughout the battery negative to chassis connection and stator to regulator connection. 

  1. Phenomenal Testing 

Put out the stator and check with your naked eyes, maybe wires were disconnected, the thermal system was damaged, coil insulation was distorted. Check the connection between the stator and the rotor, or the magnet was displaced from its position. These bad signs are notifying you to change the previous stator. 

These four testing methods are enough to find out the situation of any stator or if you are not understanding the facts, please contact the experienced riders or a dirt bike mechanic. 

What causes a stator to fail? 

There could be several reasons for the failure of any stator, but here I’m pointing out the main causes. 

  1. Power Overloaded- You might have heard or seen that using all the components at the same time can damage the fuse of electricity. Following the same pattern, if you are using a headlight, GPS, stereo and other accessories require more power to run them simultaneously. And it’s stator which will generate the power for well functioning. And then overload will reduce the lifeline of the stator & one day it will completely shut down. 
  1. Passage Of Time – Everyone has an expiry date, so a stator also will be ended. When you run a bike, it vibrates and riding a bike in any weather will also affect the stator. Although you can extend the period of a stator with a careful maintenance routine. But the reality is one day it will die. 
  1. Major Accident – Sometimes we don’t notice that a stator can be damaged in a major accident. However, it’s a small part but without this, no bike will start. So such incidents can also be a big factor for the failure of a stator. 

I guess you find all the main possible causes behind a bad stator.

You can prevent it for a longer time, don’t use all accessories at the same time, ride safely to avoid accidents and also keep your eyes on the stator by checking its condition regularly. 

How to repair a stator?

As you know why your stator has been damaged and also testing knowledge to find the accurate situation. But, you can do one more thing by yourself, repairing. Yes, it will save you money and also you gain a new skill. 

Once you will be confirmed that the stator has been damaged and replacement is required, just follow the instructions below. First, buying a new stator costs nearly $300 to $1500 depending on which kind of stator you will buy. 

  1. Remove the old stator- the stator is attached under the left side of the engine. Take it out gently and inspect what’s the problem. Don’t burn the stator; it can shorten all three-phase windings. 
  1. Separate epoxy- Next step is to separate epoxy from winding, removing epoxy can be tough as once you remove it, all winding can be put out easily. 
  1. Repairing- It will sound weird that you need to re-wound the stator, file off any sharp edge of the stator. Buy a new AWG wire and check your bike for an enamelled copper wire. Now you need to wind all three terminals one by one, you can take help from the experts. 
  1. Covering- The last step is to cover the entire setup, the stator, three winding terminals in an insulating paint. After covering the stator, put it inside the oven at a temperature of 300 degrees for at least thirty minutes.
  1. Reconnection- Once all setup has been done, connect all three connecting wires with the three coils and set it back to the original place. Here your bike is ready to run. 

Use the correct tools and also don’t burn your hand while setting the coating inside the oven. 

Note:- It might be possible that the multimeter does not always show accurate measurements. You should check it on already known measurements just for confirmation and later do your task. 

Conclusion

I’m feeling glad to tell you how effectively I dealt with today’s topic: how to test a dirt bike stator? It was useful to you and I’m sure you have fixed the problem already. Subscribe to our newsletter for more posts in the upcoming days. 

Sources:

Root cause analysis of motor stator failures, Symptoms Of A Bad dirt bike Stator, Dirt bike ALTERNATOR VS. STATOR, How to Test Your dirt bike Charging System, How to Test the Stator on a dirt bike, Testing your pit bikes’ electrics, Stator Magneto, how to diagnose dirt bike,

Thomas A. Talley

I’m Thomas. Since childhood, I am fond of bikes and hence dirt bikes are my passion now. Ever since then, I’ve been giving advice to the beginners and this has become my hobby.

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