Test Your Lawn Mower Stator in 5 Easy Steps – A Complete Guide


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Are you experiencing issues with your lawn mower? One of the most common problems that can arise is a malfunctioning stator. The stator, which is responsible for generating electrical power to keep your lawn mower running, can wear out or become damaged over time. However, before you assume the worst and replace it entirely, it's important to know how to test a stator on a lawn mower.

Properly testing your stator will help you diagnose the issue accurately and save money in unnecessary repairs or replacements. In this article, we'll walk through step-by-step instructions on how to test a stator on a lawn mower using simple tools found in most garages. By following these instructions carefully and paying attention to key details throughout the process, you'll be able to determine whether or not your stator needs replacing and get back to maintaining that perfect garden oasis.

Read on for expert advice on how best to navigate this process so that you can ensure optimal performance from your trusty lawnmower!

How to Test a Stator on a Lawn Mower

If your lawn mower is not starting or is experiencing electrical problems, it may be due to a faulty stator. The stator, which is part of the ignition system, generates electrical power for the battery and spark plug. A damaged or malfunctioning stator can cause your lawn mower's engine to fail.

But how do you know if your stator is faulty? In this article, we will discuss how to test a stator on a lawn mower step-by-step.

Understanding the Stator

Before we dive into testing procedures for the lawn mower’s stators, let us understand what it does and its components.

The engine's crankshaft drives several magnets mounted externally in an alternation pattern around the flywheel (rotor). These moving magnets generate energy in 2 ways:

  • AC voltage output by each coil winding per pass of magnet
  • Voltage generated between each coil as they move through magnetic fields at different times.

These magnet movements induce electricity into multiple wire windings located inside of an iron core called "stators." While there are many variations between manufacturers’ designs; all have three common elements:

  1. two copper wire windings embedded around an iron-core structure.
  2. Input sensor that sends signals back-and-forth about power needs from other engine components (e.g., battery voltage).
  3. Output connections producing current flow via rectifier diodes attached within circuitry responsible for converting AC->DC voltages sent throughout various parts/systems onboard machine(s).

Tools Needed

To perform this test successfully you will need:

  • Digital multimeter / DMM
  • Probes or leads compatible with DMM
  • A service manual specific for your model and make equipment.

Step-by-step Testing Procedure

Step #1: Disconnect Battery & Plugs from Spark Plug Wires

Disconnect battery cables completely before testing. Make sure you remove any plugs attached to spark plug wires as well.

Step #2: Locate the Stator

The stator is situated underneath the flywheel on top of your lawn mower's engine block. You may need to remove some parts like shrouds or covers around your engine housing before accessing it.

Step #3: Inspect Stator Components for Visual Damage

Before testing, visually inspect the stator components for any signs of physical damage or wear such as cracks, broken wires/leads, and burnt insulation etc., because if these issues found with a naked eye then there will be no use proceeding with tests and must replace it immediately.

Testing Continuity

Continuity is defined in electrical terms by having a complete electrical circuit between two points- meaning that electricity has an unbroken path through all connections between point A & B.

To test continuity in your lawnmower's stators follow this procedure:

Step #4: Set Your DMM To Continuity Mode

Turn on your DMM (Digital Multimeter) and set it to continuity mode – commonly represented by a sound icon appearing on many models when selected.

Step#5 Test Coil Windings For Resistance

Take one probe from meter output; place onto one wire connected at each side of coil winding while other probe makes contact with other wire lead opposite coil winding.
If reading indicates infinite resistance then replace bad part (aka "open") otherwise proceed further into next test round:

Voltage Output Tests

The next step in determining if you have issues with powering up devices onboard equipment using stators involves voltage output tests which are key indicators whether system is functional or not!

Follow these steps below for thorough voltage-output analysis:

Step#6 Check AC Output Voltage At Different RPMs Levels

Set multimeter’s ACV range; attach probes across each pair leads coming off coils representing phase windings.
Now, start engine and observe readings on meter while varying RPM range.
Common nominal values should be around 30VAC for each coil winding.

Step#7 Check DC Output Voltage Across All Coils

Set multimeter to its 20VDC or higher range then connect leads across various output connectors (usually two at a time) vs. ground connection points onboard equipment.
Start engine again and watch voltmeter readings carefully as they can indicate regulator concerns if found outside standard ranges.


By following these step-by-step testing procedures, you can determine whether your lawn mower's stator is working correctly or not. Remember, before conducting any diagnostics with your equipment read through the service manual specific for your model as it provides information about how to conduct tests safely and efficiently.

If you continuously test the stator from time to time, it will provide helpful in detecting any problems early on before they escalate into significant issues that may require replacement of even more expensive parts of machinery like engines etc., making regular maintenance an essential part of owning a lawnmower!


What is a stator in a lawn mower and why is it important?

The stator in a lawn mower is an integral component of the electrical system that helps generate power to charge and run the battery, as well as provide electricity to power other components such as lights, ignition system, etc. It consists of stationary windings and generates alternating current (AC) electricity through the use of magnets mounted on the flywheel. The AC voltage is then converted into Direct Current (DC) voltage by way of a rectifier for charging purposes.

In simpler terms, think of it like this: if your lawn mower were an automobile engine, then your stator would be its alternator – without which you wouldn't have any car lights or radio or ability to start your vehicle. Therefore, keeping tabs on this vital component's performance over time can help extend its lifespan while also ensuring efficient operation.

How do I know if my lawn mower's stator needs testing?

There are several signs that suggest your lawnmower has trouble with its electrical system:

  • The battery doesn't seem to hold enough charge
  • The starter doesn't engage properly
  • Your headlights dim when you crank up other accessories
  • You hear abnormal noises coming from under the hood

In some cases where there are no discernable symptoms but you suspect something might be amiss due to age or lack of maintenance history – performing regular preventive checks can help identify issues before they become major problems.

Can I test my Lawn Mower Stator myself?

Yes! Testing can be done by following these simple steps:

  1. Remove spark plug wire(s)
  2. Disconnect all wires connected with Stator.
  3. Set Multimeter dial setting at 20V AC range.
  4. Take another person’s help who can pull recoil while we keep multimeter leads on connector ends until maximum number achieved at highest RPM level reached during pulling recoil back which should show a reading between 30 to 40 volts.

If you don't have access to a multimeter, then most lawn mower repair shops will test the stator on your behalf for a nominal fee.

Can I replace the Stator myself if it's faulty?

Replacing a stator can be quite challenging and is not recommended unless you have prior experience in working with small engines or electrical systems. This is because it requires careful removal of many other engine components that must be put back together precisely for everything to function as intended.

However, If you do feel confident enough to take on this task yourself, then here are some general steps:

  1. Remove all necessary shrouding and covers.
  2. Disconnect wires that power the stator.
  3. Unscrew bolts holding the old part in place.
  4. Install new Stator carefully into place while ensuring proper alignment with magnets from flywheel
    5.Connect all wires correctly
    6.Test again using method described earlier

How often should I test my Lawn Mower's Stator?

It is recommended that testing procedures are performed during routine maintenance intervals or whenever symptoms of trouble arise such as those listed above – at least once every season if not more frequently depending upon usage patterns (for instance, more frequent use may require testing after every few weeks). By following these guidelines – along with regular cleaning and upkeep of your machine – one can expect an extended lifespan out their lawn mower!


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