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Armature-Magneto

Part Number: 591420
Briggs and StrattonToro
Availability: 25+ in stock
Price: $57.45
Ships within 1 business day

*This part replaces obsolete part #: 793281, 793352, 792594, 395489, 398593 and 496914.

Product Information
Manufacturer: Briggs and Stratton, Toro
Product Number: 591420
Classification: Part
Weight: 0.77 lbs.
Shipping: Ships Worldwide
Description:
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.
Compatibility

This part is compatible with the following machines:

Briggs and Stratton
Toro
Expand the 150+ compatible machines
Products Compatibility

This item works with the following types of products:

  • • Engine
  • • Generator
  • • Lawn Mower
Questions & Answers

No questions have been asked yet
Repair Instructions: Submitted by Customers Like You
13 of 17 people found this instruction helpful
Tool Type:
Engine
Parts Used:
Armature-Magneto - 591420
Repair Difficulty:
Medium
Time Spent Repairing:
30-60 minutes
Tools Used:
Screwdriver, Socket set, Wrench Set
Roto tiller did not start
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.
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9 of 10 people found this instruction helpful
Tool Type:
Lawn Mower
Parts Used:
Armature-Magneto - 591420
Repair Difficulty:
Easy
Time Spent Repairing:
15-30 minutes
Tools Used:
Socket set
My lawn mower would run for about 20 minutes under load and then quit.
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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4 of 4 people found this instruction helpful
Tool Type:
Engine
Parts Used:
Armature-Magneto - 591420
Repair Difficulty:
Medium
Time Spent Repairing:
30-60 minutes
Tools Used:
Screwdriver, Socket set
My Mclane edger had no spark to plug.
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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3 of 5 people found this instruction helpful
Tool Type:
Lawn Mower
Parts Used:
Armature-Magneto - 591420
Repair Difficulty:
Medium
Time Spent Repairing:
30-60 minutes
Tools Used:
Wrench Set
Would not start
Remove the cover. Install and adjust the new magneto. Replace cover.
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Tool Type:
Lawn Mower
Parts Used:
Armature-Magneto - 591420
Repair Difficulty:
Medium
Time Spent Repairing:
30-60 minutes
Tools Used:
Socket set, Wrench Set, Nutdriver
Would not start
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.
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Tool Type:
Lawn Mower
Parts Used:
Armature-Magneto - 591420
Repair Difficulty:
Easy
Time Spent Repairing:
15-30 minutes
Tools Used:
Screwdriver, Pliers, Socket set
No spark.
Replaced the magneto, the new coil did not require the points or condenser to get a spark to the plug.
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Tool Type:
Lawn Mower
Parts Used:
Boot-Spark Plug - 66538S
Armature-Magneto - 591420
Repair Difficulty:
Easy
Time Spent Repairing:
Less than 15 minutes
Tools Used:
Socket set
Lawnmower would not run - coughed a couple times then stopped
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.
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Tool Type:
Lawn Mower
Parts Used:
Armature-Magneto - 591420
Repair Difficulty:
Easy
Time Spent Repairing:
30-60 minutes
Tools Used:
Screwdriver, Pliers, Socket set, Feeler gage
Lawn mower would not start.
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.
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2 of 4 people found this instruction helpful
Tool Type:
Engine
Parts Used:
Armature-Magneto - 591420
Repair Difficulty:
Easy
Time Spent Repairing:
Less than 15 minutes
Tools Used:
Screwdriver, Pliers, Wrench Set
Coil not generating spark.
Replaced the old part with the new one.
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Tool Type:
Engine
Parts Used:
Armature-Magneto - 591420
Repair Difficulty:
Easy
Time Spent Repairing:
30-60 minutes
Tools Used:
Screwdriver, Pliers, Socket set, Wrench Set
Engine had no spark
I was glad to see installation instruction included with the part.
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Reviews
4.3
Average Rating (out of 5):
3 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
    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
    Verified Purchase
    eReplacementParts Team
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    Product Information
    Manufacturer: Briggs and Stratton, Toro
    Product Number: 591420
    Classification: Part
    Weight: 0.77 lbs.
    Shipping: Ships Worldwide

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