Easy
30-60 minutes
This replacement armature-magneto is specially designed for use with Briggs and Stratton engines commonly installed on Toro lawn and garden equipment. It is an authentic part sourced directly from original equipment manufacturer. The armature-magneto also known as an ignition module produces pulses of high voltage for the spark plugs. This item includes (1) armature-magneto and (1) lead wire per order.
To complete this repair you will need screwdriver set.
Armature-magneto 591420
OEM part for: Briggs & Stratton, Briggs & Stratton Engines
Part Number: 591420
$61.65
In Stock
Ships within 1 business day 
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Product Description ?
- Classification: Part
- Weight: 0.77 lbs.
- Shipping: Ships Worldwide
Frequently Purchased Together ?
Compatibility
This Armature-magneto will fit the following 25282 machines. Confirm this part works with your model, and view the detailed model diagrams and repair help we have to offer.
Briggs & Stratton Engines
Show More Compatible ModelsThis item works with the following types of products:
- Engine Parts
This part replaces obsolete part #: 793281, 793352, 792594, 395489, 398593, 496914
Customer Part Reviews ?
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Part did not fit.
This Briggs and Stratton part did not fit. It was the correct replacement part number according to Briggs and Stratton webpage but did not fit. This motor was an old flathead design and has been unavailable for years.
Ereplaceparts handled the return in a most professional manner.
👍👍👍👍
Guest -
October 9, 2019
Verified Purchase
Did not match the picture of the one I ordered
The edger is working again. But it did not have the slot for the governor to slide over like the picture showed when I purchased it.
David -
October 20, 2023
Verified Purchase
Engine won’t start no spark
I got the part quick and it was easy install engine running good now
David -
June 28, 2021
Verified Purchase
waited three months for a part for a 30 year old motor
After a 3 month wait for the mag assembly for my edger, I now have a motor that runs better than new. I had no doubt that as soon as the part was available I would get it. It was worth with the wait. I received a monthly update on the status of my order, I liked that.
Jay -
September 26, 2019
Verified Purchase
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Customer Repair Instructions ?
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part.
Roto tiller did not start
Felice - January 3, 2016
👍 16 of 20 people found this instruction helpful
Tool Type
Engine
Difficulty
Medium
Time
30-60 minutes
Tools Used
Screwdriver, Socket set, Wrench Set
Parts Used
Tested if there was a spark , there was no spark. Replaced spark plug, still no spark. Replaced the Magneto, the engine worked normal.
I learned how to replace the Magneto by looking at the assembly drawing of the engine, available on ereplacementparts web site.
I learned how to replace the Magneto by looking at the assembly drawing of the engine, available on ereplacementparts web site.
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My lawn mower would run for about 20 minutes under load and then quit.
Mark - May 24, 2016
👍 11 of 12 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Easy
Time
15-30 minutes
Tools Used
Socket set
Parts Used
It was a very easy repair. I removed the cover from the top of the engine, then I removed the small bolt holding the engine governor air flow sensor, then I removed the last bolt remaining in the magneto. I unplugged the spark plug wire, lifted the magneto and unplugged the low tension wire from underneath. I reversed the procedure to install the new magneto with one exception, I tore two small pieces of cardboard from the lid of the box that the part came in to use as spacers between the magneto and the flywheel of the mower. After I had the bolts for the magneto snugged down I removed the cardboard spacers and finished assembly.
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No spark.
Ernest - December 29, 2021
👍 4 of 4 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, Pliers, Socket set
Parts Used
Replaced the magneto, the new coil did not require the points or condenser to get a spark to the plug.
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Lawnmower would not run - coughed a couple times then stopped
Stephen - May 18, 2021
👍 4 of 4 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Socket set
1. Diagnosed "not running" as a "no spark" problem
2. Ordered new armature magneto (AM) and spark plug boot from eReplacementParts.com
3. Read included directions
4. Put mower on workbench, disconnected spark plug cable, removed top cover and cleaned.
5. Removed spark plug. Removed 2 hex bolts and wire, lifted old AMout.
6. Rotated mower flywheel to opposite side per directions, attached wire to new AM, bolted into place per instructions, leaving big space between new AM and flywheel.
7. Again per instructions, rotated mower flywheel so that magnets face AM. Placed 0.010-inch thick card (included with AM) between AM and flywheel.
8. Loosened and re-tightened bolts. Now there is a 0.010-in gap between the AM and flywheel.
9. Reassembled. Put mower on floor and connected spark plug.
10. Gave a mighty pull and mowed my lawn.
2. Ordered new armature magneto (AM) and spark plug boot from eReplacementParts.com
3. Read included directions
4. Put mower on workbench, disconnected spark plug cable, removed top cover and cleaned.
5. Removed spark plug. Removed 2 hex bolts and wire, lifted old AMout.
6. Rotated mower flywheel to opposite side per directions, attached wire to new AM, bolted into place per instructions, leaving big space between new AM and flywheel.
7. Again per instructions, rotated mower flywheel so that magnets face AM. Placed 0.010-inch thick card (included with AM) between AM and flywheel.
8. Loosened and re-tightened bolts. Now there is a 0.010-in gap between the AM and flywheel.
9. Reassembled. Put mower on floor and connected spark plug.
10. Gave a mighty pull and mowed my lawn.
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My Mclane edger had no spark to plug.
Terry - June 14, 2016
👍 4 of 4 people found this instruction helpful
Tool Type
Engine
Difficulty
Medium
Time
30-60 minutes
Tools Used
Screwdriver, Socket set
Parts Used
My edger is 27 years old, so the difficult part was finding the correct magneto. It comes out with two small bolts. I re-terminated the spark plug terminal to shorten the plug wire. The magneto comes with a few spare parts. Starts on first or second pull. Three bolts on the pull start assembly had to come out and the pull cord assembly and shroud had to be pulled. Very easy to do. I saved $240.00 on a new edger.
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Lawn mower would not start.
Dave - June 4, 2020
👍 2 of 2 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Easy
Time
30-60 minutes
Tools Used
Screwdriver, Pliers, Socket set, Feeler gage
Parts Used
Checked for spark.
No spark.
Replaced spark plug.
Checked kill switch for grounding out.
It was fine.
Still no spark.
Removed cover to get to the coil.
Removed coil clean coil and fly wheel and reassembled with .010 air space between coil and fly wheel.
Got spark and engine started, but only worked for a while.
Replaced the coil and wire. Works fine.
No spark.
Replaced spark plug.
Checked kill switch for grounding out.
It was fine.
Still no spark.
Removed cover to get to the coil.
Removed coil clean coil and fly wheel and reassembled with .010 air space between coil and fly wheel.
Got spark and engine started, but only worked for a while.
Replaced the coil and wire. Works fine.
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Would not start
Daniel - October 8, 2022
👍 1 of 1 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Medium
Time
30-60 minutes
Tools Used
Socket set, Wrench Set, Nutdriver
Parts Used
If you suspect the mag and have not replaced the plug. Do that first.
Plugs wear out and can't be cleaned anymore.
When replacing the governor air vane, the screw made a dimple in the mag surface which caused it to bind.
I added a washer under the screw to stop this. That raised the assembly and caused it to catch on the starter shroud. I hammered that out to relieve.
The old air vane interfered with the new mag. I cut a notch in the air vane to clear.
Hardest part was repairing the governor carb springs. Small one is the idle. Bend opp end tab to adjust idle which that spring alone mounted. Large spring is high/low.
Adjust to raise speed when in position. Look for stretched spring coils. Fix by wrapping copper wire strands to join them together and make spring shorter.
This will increase tension and make engine speed higher if needed.
Plugs wear out and can't be cleaned anymore.
When replacing the governor air vane, the screw made a dimple in the mag surface which caused it to bind.
I added a washer under the screw to stop this. That raised the assembly and caused it to catch on the starter shroud. I hammered that out to relieve.
The old air vane interfered with the new mag. I cut a notch in the air vane to clear.
Hardest part was repairing the governor carb springs. Small one is the idle. Bend opp end tab to adjust idle which that spring alone mounted. Large spring is high/low.
Adjust to raise speed when in position. Look for stretched spring coils. Fix by wrapping copper wire strands to join them together and make spring shorter.
This will increase tension and make engine speed higher if needed.
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Engine had no spark
Michael - May 29, 2016
👍 1 of 1 people found this instruction helpful
Tool Type
Engine
Difficulty
Easy
Time
30-60 minutes
Tools Used
Screwdriver, Pliers, Socket set, Wrench Set
Parts Used
I was glad to see installation instruction included with the part.
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Would not start
howard - July 26, 2016
👍 3 of 6 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Medium
Time
30-60 minutes
Tools Used
Wrench Set
Parts Used
Remove the cover. Install and adjust the new magneto. Replace cover.
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Coil not generating spark.
Donald - May 3, 2018
👍 2 of 5 people found this instruction helpful
Tool Type
Engine
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver, Pliers, Wrench Set
Parts Used
Replaced the old part with the new one.
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Our product descriptions are a combination of data sourced directly from the manufacturers who made your product as well as content researched and curated by our content & customer service teams. This content is edited and reviewed internally before being made public to customers.
Our customer service team are at the ready daily to answer your part and product questions. We have a dedicated staff with decades of collective experience in helping customers just like you purchase parts to repair their products.
All our part reviews are solicited directly from other customers who have purchased this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
Based on data from past customer purchasing behaviors, these parts are most commonly purchased together along with the part you are viewing. These parts may be necessary or helpful to replace to complete your current repair.
All our installation videos are created and produced in collaboration with our in-house repair technician, Mark Sodja, who has helped millions of eReplacementParts customers over the last 13 years repair their products. Mark has years of experience in selling and repairing both commercial and residential products with a specialty in gas-powered equipment.
This data is collected from customers who submitted a repair instruction after replacing this exact part. Customers can rate how easy the repair was to complete and how long it took. We aggregate this data to provide a repair rating that allows customers to quickly determine the difficulty and time needed to perform their own repair.
