A internally shorted battery can cause premature stator/rectifier failure due to an over worked system. As well, check Ohm ratings for battery cables, as high resistence can overwork the system.

What would cause a stator to burn up?

A bad diode in a rectifier will dump AC current into a system. The AC current heats up the stator and the heat destroys the insulation and ultimately carbonizes it turning it into a low resistance brick.

How long does a stator last on a Harley Davidson?

How Long Does a Harley Stator Last? A Harley Stator is expected to last for 150,000 miles on a Harley-Davidson motorcycle that's never had electrical issues.

What happens when a stator fails?

The stator coil generates the power for the spark plug and other accessories on small engines Without a stator there would be no spark at all, meaning the engine won't run. While a stator is dying, it can produce a weak spark, causing the engine to miss or run poorly. Symptoms are often worsened as the engine warms up.

Why do Harley stators fail?

Stator Failure:

Often times, a short can happen in the windings around the stator. The insulation on the wires can wear down over time or a wire can break. If the copper inside the insulation rubs against the flywheel as an example, you could have the windings short to ground.

27 related questions found

What causes a motorcycle stator to burn out?

This voltage can be thousands of volts from just a 12 volt circuit. That high voltage spike can punch through the enamel insulation in the stator coils and cause them to short out.

What are the symptoms of a bad voltage regulator on a motorcycle?

Key Signs to Look For

You won't have any trouble diagnosing the faulty regulator rectifier if the battery is the cause. You'll note signs right away like poor starts, fluctuating meter readings, and dimmed headlights. around 13 volts, the bike will start to drain the battery.

Will a motorcycle start with a bad stator?

Without a stator, your motorcycle will not get any spark at all as your battery is not capable of supplying the appropriate power levels to generate a spark. As a result, if your stator is going bad your motorcycle will run very poorly. Eventually, your stator can prevent your motorcycle from starting at all.

How do I know if my stator is bad on my Harley?

If voltage does not rise above 12v then it's most likely the stator.
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Pretty easy to figure out if stator is bad or not.

  1. Check voltage of battery prior to startup (should be 12v).
  2. Start bike.
  3. Check voltage while bike is running, should at least reach above 13v, and increase with rev's increase.

How do you fix a bad stator?

Fixing a stator usually involves unwinding and cleaning the original stator core, then rewinding it with a machine or carefully by hand. It starts with looking at the coil heads for damaged or burned wires, then cutting out the protective rubber coating from damaged coils.

Can you repair a stator?

In many cases a new stator is the safest, most cost-effective solution for an electrical system breakdown. Because repairing stators can be an intricate and detail-intensive process, replacing failed stators with an entirely new part can be a much easier route, depending on the specific motorcycle.

Does a stator charge the battery?

In simple terms, the battery provides this power. The battery would quickly be depleted, though, if not for the star of the charging system show, the stator. Think of your stator as the piece that makes electricity to keep your battery charged up to make all that electrical stuff on your bike work.

How do you test a motorcycle rectifier?

Start the motorcycle and rev the motor to 5000rpm. Using the multimeter, test the same battery terminals again. You should receive a reading of 13.5 to 14.5 volts if your rectifier-regulator is functioning correctly.

What is a stator on an outboard engine?

A stator is a component on an engine that is attached under the flywheel of the engine. The engine's flywheel has magnets attached to the inside of it, that spin around the stator. The stator is made up of windings that produce alternating current electricity.

How do I know if my stator or rectifier is bad?

Insert each probe into a stator socket. You should read around 0.2 to 0.5 ohms. If you show an open circuit with the “Open” or infinity reading or have higher resistance, then the stator is bad and you must replace it. If these tests all produce positive results, then the stator itself is good.

What happens when voltage regulator goes bad?

Probably, the most common symptom associated with a bad regulator is flickering, dimming, or pulsing lights. To be more specific, you may notice that the vehicle's: Headlights fluctuate between bright and dim, without you doing anything. High beam isn't working as expected.

Will a quad start with a bad stator?

An ATV will not start with a bad stator. The engine requires an electrical current from the stator to power the coil and fire the spark plug. Symptoms of a faulty stator may include: No start.

How do you test a Harley stator?

Stator IB test or Ground Check:

  1. Switch your multi-meter to Ohm x 1 scale.
  2. Probe each stator wire with your positive lead on multi-meter and the negative to ground.
  3. There should be no continuity to ground on either wire.
  4. If there is continuity to ground, your stator is shorted to ground.

What does Harley Davidson stator do?

Simply put, a stator works together with a rectifier regulator to accomplish the same outcome as an alternator—to generate the DC power required to operate the motorcycle, ATV, side-by-side, etc. The stator is the coil of wire housed inside the engine case.

What are symptoms of a bad CDI box?

CDI Box Troubleshooting

  • Misfires.
  • Rough running.
  • Difficulty starting.
  • Other ignition problems.
  • Engine stalling.

What are the symptoms of a bad voltage regulator on a Harley Davidson?

Sign of a Bad Voltage Regulator on a Harley Davidson

  • Power Failure.
  • Headlights burn out over time.
  • Gas fusing out of battery.
  • Malfunction in engine light.
  • Gauge Flickering.
  • Error reading the cluster.
  • Faulty voltmeter reading.

Is a stator and magneto the same thing?

Free Member. The stator and the magneto really can be thought of as the same thing. Simply put the stator is the stationary, wire wound portion of the power generation system. Magneto is the common name used when describing a permanent magnet to produce alternating current.

Is a stator and alternator the same thing?

The biggest difference in a stator and an alternator is the stator (if equiped) outputs AC voltage to a rectifier and sometimes regulator. An alternator has the rectifier built in and outputs DC voltage and is rated at much higher amperage.. Your 90 horse Merc has 12 poles as part of the stator.