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How can I check if the coil on my lawn mower is defective? It appears to be a simple magneto operation.

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Remove the spark plug.Reconnect it to the wire.Lay the plug so it can be touching the metal part of the engine.Try to start the mower just as you would to get it going. Of course it wont start but look at the spark plug to check and see that it has a strong,consistant spark. Thats how I would check the coil.
I hope this helps you.

Posted on Sep 24, 2009


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I installed a new magneto on my toro 6.5 gts lawn mower and still only get a weak and intermittent spark how do I correct this problem?

bob, i believe the magneto only charges the battery, if you have weak or intermittent or no spark i would look at the spark plug or the coil as the coil is what causes the spark. if plug is weak, the coil is bad or even the wire on the bottom of the coil. it is a ground. unhook that and see if it has spark. if it does the coil is your problem. good luck

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1 Answer

What supplies voltage to spark plugs?

The spark on the 25 hp Kohler is Magneto. There is likely an interlock to the PTO and Seat safety interlock. The magneto appears in some lawn garden applications to be connected via the safety interlock?

So when the engine turns the magnetic field of the flywheel activated the engine spark but if the interlock safety switches are not enabled the spark the magneto is disabled resulting in no spark. A lost spark is likely a defective or corroded switch.

I hope this helps?

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Defective coil 211212008

This is fairly easy... Remove the 2 bolts on top of the coil.. grab your new one and put that on BUT don't tighten the bolts all the way yet.. grab a business card, stick it between the coil points and the flywheel magneto.. once both the coil points and magneto magnetize together, tighten the bolts down all the way... the business card is the exact clearance you need between the flywheel and coil.. nowe spin flywheel by hand just to make sure that it won't hit the coil points as it passes...

U can do this bud, good luck, let me know how u made out

Nov 02, 2015 | John Deere Garden

1 Answer

Why Spark on Briggs and straiten motor?

Does it have a shutoff wire on the carburetor?

Use a meter to check the coil at the magneto - if that coil reads "open" (no continuity), then it's bad & needs replacement.

Jul 26, 2014 | Garden

1 Answer

What is the magneto

it dosent have a magneto its got a all in one coil to check to see if working remove plug hold to motor houseing try to start watch for spark at plug

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1 Answer

Jd lawn mower was only firing on 1 side coil and i changed coil so why is it still not firing

You only have one magneto on the flywheel, this is how any flywheel is designed because both cylinders can't fire at the same time, so why have two magnetos to fire one coil? Anyways, the magnetos on flywheels from my experience hardly if EVER go bad, and coils today have so many capacitors and resistors and diodes inside that even the slightest amount of heat soak from a poorly maintained engine can fry the circuitry and fault a coil in a flash. If you replaced te coil and it won't work, try to swap the coils around and see if the one you know works won't fire on that non-working cylinder, that way you can be sure the new coil is not defective, which I've seen many times as well. When it's running, do you pull the plug off the dead cylinder and see if it fires, then repeat the procedure on the live cylinder with the dead coil installed on the plug? Will it fire at all? Try to disconnect the kill wire from each coil, then start the engine and see if both cylinders fire now. I have seen some engines, as an example some briggs vanguard v-twins that have a diode right in the middle of the kill switch wire. I don't know why it's there, probably to deal with spikes in current or something, I'm not that great with electrical I just know how a simple ignition system works and I know if one coil fires that plug, the other one should too. As I said, things from china areive defective all the time, it wouldn't surprise me if that coil is defective or if it runs with the kill wire disconnected from the coils, then there may be a diode blown in the line or you have a chafed area of insulation that's grounding to the book somehow. Pull the kill wire and fire it up, then swap coils, you'll be able to tell what's wrong once you rule out one or the other, it's just a simple process of elimination for a simple problem once it's explained to you. I'm sure you'll figure it out and be back running in no time I you attempt my suggestions!

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1 Answer

I have a craftsman 675 and it has not spark. I have replace the coil/magneto with no change to the lack of spark. I am wondering if the coil is not grounding properly. Any ideas, Thanks?

I believe your problem is not the coil/magneto but rather your timing. If you hit something hard with the blade you most probably sheared the timing key. This key is what keeps your flywheel in the proper timing position.
Remove cover top of engine, remove flywheel bolt,remove flywheel, remove key. If key is sheared off or even dented replace.Put back together. Happy mowering.

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