Easy
15-30 minutes
This ignition module is a genuine OEM sourced replacement part that is specially made for use with Husqvarna chainsaws. The purpose of this part is to supply pulses of high voltage electricity to the spark plug. This ignition module is sold individually, it includes the durable rubber insulated wire and the spark plug boot.
Ignition Module 573935702
OEM part for: Husqvarna, Jonsered
Part Number: 573935702
$34.86
In Stock
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Compatibility
This part will fit the following 17 machines
Husqvarna
435 (2008-05) Chainsaw View Diagrams & Manuals
435 E (2008-05) Chainsaw View Diagrams & Manuals
440 E (2008-05) Chainsaw View Diagrams & Manuals
445 (2007-03) Chainsaw View Diagrams & Manuals
445 (2007-09) Chainsaw View Diagrams & Manuals
445 E (2007-03) Chainsaw View Diagrams & Manuals
445 E (2007-09) Chainsaw View Diagrams & Manuals
450 E (2007-03) Chainsaw View Diagrams & Manuals
450 E (2007-09) Chainsaw View Diagrams & Manuals
450 (2011-07) Chainsaw View Diagrams & Manuals
450 (2010-09) Chainsaw View Diagrams & Manuals
Jonsered
CS2245 (2008-09) Chain Saw View Diagrams & Manuals
CS2245 (2009-02) Chain Saw View Diagrams & Manuals
CS2245 S (2008-09) Chain Saw View Diagrams & Manuals
CS2245 S (2009-02) Chain Saw View Diagrams & Manuals
CS2250 S (2008-09) Chain Saw View Diagrams & Manuals
CS2250 S (2009-02) Chain Saw View Diagrams & Manuals
Show More Compatible Models
This item works with the following types of products:
- Chain Saw Parts
- Saw Parts
This part replaces obsolete part #: 544243801, 573935701, 505427201
Customer Part Reviews ?
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Easy Repair.
Part was in great condition , fit perfectly and was easy to install. Chainsaw was never this easy to start.
Calvin -
June 16, 2020
Verified Purchase
Started on the second pull
It arrived on time and fixed the chain saw
Guest -
October 15, 2019
Verified Purchase
arrived quick-works great
Guest -
July 30, 2019
Verified Purchase
huqvarner
I clicked on huqvarner web site and got you very misleading
Guest -
November 6, 2019
Verified Purchase
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t days ago
Verified Purchase
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Questions & Answers ?
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Does this fit my product?Questions & Answers for Ignition Module
Ordered a ignition coil for 450 chainsaw ,now it starts but wont rev backfires and cuts off! Is this another bad coil? Already checked flywheel key, and gapped @ .3mm
Michael
for model number 450
asked on 2022-04-14
Hello Michael, Thank you for the question. The correct gap for this is .010 inches/.25mm. I would try resetting the gap to .25mm. A business card is perfect for setting the gap. Loosen the module then insert a business card in between the flywheel and the module. Rotate the flywheel so that the magnets are facing the module then let the magnets pull the module in. Next, tighten the module and remove the business card and fire up the engine. You may also want to make sure the spark plug is clean and gapped as well. I hope this helps and good luck with your repair.
eReplacementParts Team April 14, 2022
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.
Chainsaw abruptly quit running and would not restart
David - January 22, 2016
👍 21 of 21 people found this instruction helpful
Tool Type
Chain Saw
Difficulty
Easy
Time
15-30 minutes
Tools Used
Nutdriver, Torx bit
Parts Used
Problem was diagnosed by pulling plug. Saw that it was getting gas, so with the plug attached to the lead and grounded to the top of the cylinder I pulled the starter rope and saw no spark. I suspected a bad ignition module. I ordered one and replaced it and the saw started right up. Very easy to replace on the Husqvarna 454: Remove side cover, unscrew module and replace, gap the module at.010 from the flywheel magnets. replace cover, put in a new spark plug.
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Saw stopped abrubtly and would not restart.
Mike - May 5, 2016
👍 7 of 7 people found this instruction helpful
Tool Type
Chain Saw
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver, Hex keys
Remove spark plug and check for spark, compression and gas.
No spark noted.
Replaced ignition module, saw starts and runs.
Be sure to check gap between module and flywheel magnet at 0.10, flywheel should turn freely as it passes the module.
No spark noted.
Replaced ignition module, saw starts and runs.
Be sure to check gap between module and flywheel magnet at 0.10, flywheel should turn freely as it passes the module.
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Would not start
Paul - January 30, 2017
👍 3 of 3 people found this instruction helpful
Tool Type
Chain Saw
Difficulty
Medium
Time
Less than 15 minutes
Tools Used
Screwdriver, Hex tool Set, .012 feeler gauge
Parts Used
1. Removed starter assembly
2. Removed old ignition module
3. Installed new module checking gap with feeler gauge
4. Replaced starter assembly
5. Started saw to check out repair
2. Removed old ignition module
3. Installed new module checking gap with feeler gauge
4. Replaced starter assembly
5. Started saw to check out repair
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Intermittant and no spark.
Paul - August 29, 2016
👍 2 of 2 people found this instruction helpful
Tool Type
Chain Saw
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, hex key, feeler gauge
Parts Used
Remove recoil side cover, blow out debris with air compressor. Note clearance between flywheel and coil poles. Remove screws holding coil, detach wires. Reverse process to reassemble, Reset clearance on coil, tighten screws while maintaining the clearance. Put cover back on and tighten cover screws. Screws need to be very snug as the vibration will loosen them otherwise. Been there so order a couple extra when you order the coil. Done- runs like a champ now.
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Ignition Module stop firing
Harvey - July 30, 2021
Tool Type
Chain Saw
Difficulty
Easy
Time
15-30 minutes
Tools Used
Power Drill, Socket set, fila gauge
Parts Used
Removed pull starter rope cover , removed screws that hold old module , removed old module . Installed new module and screws , set with fila gauge tighten screws reinstalled pull starter rope cover .
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No spark on chainsaw
Benedict - October 18, 2019
Tool Type
Chain Saw
Difficulty
Easy
Time
15-30 minutes
Tools Used
Parts Used
Just removed the side plate that includes the starter pully and the starter module is right there.
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Chainsaw would not start
Anthony - May 30, 2019
Tool Type
Chain Saw
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver
Parts Used
Replaced ignition coil
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Chainsaw would not start
Brian - August 27, 2018
Tool Type
Chain Saw
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, Nutdriver, Feeler gauge, spark plug wrench
Parts Used
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Chain Saw would not start, was not getting any ignition spark
John - August 7, 2018
Tool Type
Chain Saw
Difficulty
Medium
Time
30-60 minutes
Tools Used
Screwdriver, Socket set, Hex wrench #4 (module screws)
Parts Used
Went to your web site and found what the problem might be.
Ordered the ignition module that was for my saw.
The part install was quite simple, removed top cover. then had to remove the pull start cord assembly, 4 screws (one complete assembly). The ignition module was right under a plastic cover, remover the 4 screws on the module and the spark plug wire. Installed the new module and covers. The saw started right up and has been running like new.
Thanks to the info on your web site it helped me ID the problem and order the right part.
Ordered the ignition module that was for my saw.
The part install was quite simple, removed top cover. then had to remove the pull start cord assembly, 4 screws (one complete assembly). The ignition module was right under a plastic cover, remover the 4 screws on the module and the spark plug wire. Installed the new module and covers. The saw started right up and has been running like new.
Thanks to the info on your web site it helped me ID the problem and order the right part.
Did you find this story helpful?
Thanks for voting and helping fellow customers!
Engine stalled and wouldn't restart. No Spark.
Tim - November 28, 2016
👍 1 of 2 people found this instruction helpful
Tool Type
Chain Saw
Difficulty
Medium
Time
Less than 15 minutes
Tools Used
Screwdriver, Allen wrench for ignition module
Parts Used
1. Remove spark plug, check for fuel fouling, clean, gapped correctly.
2. Pull starter cord with plug attached and side electrode resting on engine.
3. Note lack of spark, even in dark garage.
4. Remove kill switch circuit wire attached to module & pull starter cord.
5. Note still no spark. Remove (pull cord) cover & Ignition Module.
6. Order Ignition Module from eReplacementParts using the old IM's part number.
7. Review other people's feedback for magneto to ignition module air gap (.010").
8. Discover that common business card is .010" thick & confirm with micrometer.
9. Install ignition module using business card to hold gap while tightening bolts.
10. Check that magneto does not contact ignition module when spinning.
11. Replace cover, connect kill switch wire, install/connect spark plug & air filter cover.
11. Start engine!
Note: This module failed on me before I got through a full gallon of bar oil (in 2 years). It must have been defective to fail after so few hours of use. Part number has been updated too.
2. Pull starter cord with plug attached and side electrode resting on engine.
3. Note lack of spark, even in dark garage.
4. Remove kill switch circuit wire attached to module & pull starter cord.
5. Note still no spark. Remove (pull cord) cover & Ignition Module.
6. Order Ignition Module from eReplacementParts using the old IM's part number.
7. Review other people's feedback for magneto to ignition module air gap (.010").
8. Discover that common business card is .010" thick & confirm with micrometer.
9. Install ignition module using business card to hold gap while tightening bolts.
10. Check that magneto does not contact ignition module when spinning.
11. Replace cover, connect kill switch wire, install/connect spark plug & air filter cover.
11. Start engine!
Note: This module failed on me before I got through a full gallon of bar oil (in 2 years). It must have been defective to fail after so few hours of use. Part number has been updated too.
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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.
