Stator on a motorcycle: All you need to know

If your stator on a motorcycle is terrible and you do not know how to repair it, you could end up in a frustrating situation, and if you are one of them then this article will guide you in every possible way. 

A Stator is an essential part of any motorcycle as it impacts the overall performance and longevity. So you must know the functionality of a stator on a motorcycle and what to do if it gets damaged.

What do you mean by a Stator?

In generators, motors, and rotors, stators can be found in many forms. Stators are also stationary parts of alternators. It requires regulator conversion to keep your bike powered since stored power in the vehicle battery must be DC.

Stator components are round, containing coils with flywheels made of metal. The stator and rotor both have electromagnets, but their patterns are opposite. Electromagnets in the stator and rotor repel one another, similar that magnets with the same polarity. The rotation of the magnet rotor is dependent on the rotation of the magnetic field of the stator.

Stators in motorcycles

The stator is one of the most important parts of your bike’s electrical system. Modern bikes have many electrical needs, so riding one is not simple. Different parts of the vehicle consume varying amounts of power, including the lights, ignition, fuel pump, and starter. This power is provided by the battery.

Stators are the star of the charging system because, without them, the battery would quickly deplete. Stators produce electricity that powers all the electrical stuff on your bike so that your battery stays charged.

A motorcycle’s electric system is relatively lightweight than other vehicles since it is powered by its stator. The stators also generate AC power which is then converted to DC power for other supplies on the bike in addition to ignition.

Workflow of a Stator

There has been an increase in complexity in the electrical systems of motorcycles over the years. Modern, technology-driven motorcycles are powered by a variety of components that few riders or enthusiasts understand. Stators, circular pieces of equipment with coils wrapped around dozens or hundreds of prongs, are perhaps one of the most important components of electrical systems today

An alternator consists of a stator and a rotor/flywheel. In your motorcycle alternator, these two parts work together to generate electricity. In order to produce alternating current (AC), the flywheel and stator must work together.

The rectifier then converts the AC to direct current (DC). To run your motorcycle’s electrical loads and keep the battery charged, DC controlled by the voltage regulator is connected to the bike.

Maintenance of a motorcycle stator

The electrical charging components on your bike need some attention from time to time, just like any other system of your motorcycle. Your electrical system, in general, does not require much maintenance, but your stator does.

A professional may be better suited to handle tasks related to electrical systems if you do not have any experience with them. Whenever you disassemble your bike’s electrical parts, always follow manufacturers’ safety precautions to avoid injury.

Your motorcycle can be revitalized by swapping out most parts. Recognizing potential issues and understanding what you’re looking for are the keys to proper maintenance.

Symptoms of a faulty motorcycle stator

The symptoms of a bad stator are as mentioned below:-

No power to the spark plug

Motorbikes generate combustion when the spark plugs ignite the air-fuel mixture when the starter button is pressed. A motorbike stator that has failed is one of the signs that the component is not working properly, as it is unable to generate electricity, and as a result, the motorbike does not start.

As the name suggests, the stator is responsible for delivering the spark that the spark plug needs to ignite. Without the spark, the engine would not be able to start and run.

Due to the failure of the stator, there will no longer be a strong enough spark caused by it, which will result in the spark produced by the stator becoming very feeble. The frequency or frequency of this event may vary, depending on how often it occurs.

Headlight dimming

A power supply is required for your motorcycle’s headlamp and indicators to function properly. A consistent stable supply of electricity is required even when switching from low beam to high beam or activating motorbike indicators.

If the headlight does not illuminate, it might be because no power is being supplied to it, and the fault could be in the fuse box or at the stator.

Allow someone to start the engine while you look for a spark in the bulb. If it does not light up, your stator is faulty and must be changed.

Faster drainage of batteries

Motorcycle batteries are designed to store a specific amount of charge so that the motorcycle can perform all of its essential functions.

For the battery to remain charged, the stator and regulator/rectifier of the motorcycle must deliver a steady source of DC.

In addition, you may discover that your battery drains more quickly at night when you have your lights on. Since the headlights consume a lot of energy at night, this is a sign of a defective stator. If your bike exhibits this symptom, it is quite likely that it is due to a faulty stator.


A faulty stator can be caused by a variety of factors, the most prevalent of which are as follows:-

  • A worn-out alternator bearing may cause it to wobble and damage its stator, causing it to wobble.
  • Stator could experience problems if the wires linking the stator to the rest of the electrical system have been damaged.
  • When not properly protected from the elements, corrosion can also damage the stator.

The stator should be replaced as soon as possible if you are experiencing any of these problems. It is dangerous to ride a motorcycle with a bad stator, as it can cause a lot of damage to the engine.

How to remove a motorcycle stator?

To remove a damaged motorcycle stator you need to follow these certain steps:

  • Make sure the engine is cool
  • Make sure that the plastic fairings are removed (if applicable).
  • You need to locate the gasket cover.
  • Connect the electrical outlet to the wall socket and unplug it.
  • Multimeter all three connection points to make sure it’s the faulty component.
  • Oil can be caught in a tray placed below the engine.
  • Socket wrenches can be used to remove bolts from gasket covers.
  • Next, the stator bolts must be removed.
  • Take the stator out of the cover and remove it.
  • Remove any oil and sealant residue from the cover and body.
  • Around the output of the electrical wire, apply gasket sealant.
  • Use the bolt to secure the wire.
  • Make sure all the pins are in place from the inside.
  • Seal the perimeter of the body with gasket sealant after it has been cleaned and dried.
  • Gently secure the cover.
  • Bolts should be used to secure it. They should not be overtightened as they can break.
  • The electrical wire needs to be reconnected.
  • Then allow it to dry completely.
  • Excess sealant should be removed once it has dried out.
  • Oil leaks should be checked after starting the engine.
  • The output of the electrical power should be tested if required.

Repairing Stator yourself

It is possible to repair the stator yourself, but it is a difficult and time-consuming process. The stator will need to be removed from the bike, and it will need to be sent to a repair shop for testing and repair after it has been removed. Here are a few steps to repair the stator yourself:-

  • In the case of stator failure, corrosion is usually a problem, and corrosion can be cleaned using a wire brush or some sandpaper. 
  • Inspect all electrical connections for corrosion and make sure they are in good condition, and the wiring with the stator is unharmed.
  • Then, using a multimeter, test the windings inside the stator for any damage. If any of the windings are found to be damaged, you need to replace the stator, and it will work properly as a result.

MotorCycle Aid

MotorCycle Aid is fond of travelling and experimenting out different kinds of bikes after which we share our experiences with the blog audience.

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