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Spark Plug

Part Number: 491055T
Briggs and StrattonHusqvarnaToroLawn BoyVanguard - Briggs & Stratton
Availability: 25+ in stock
Price: $4.45
Ships within 1 business day

*This part replaces obsolete part #: 491055S ((Rc12yc - Resistor)), 594056 ((Resistor)), 4217, 491055s, 491055, 72347GS and 72347.

Product Information
Description:
This is an OEM replacement part and is sold individually.

The purpose of this spark plug is to deliver an electric current from an ignition system to the combustion chamber of a gas fueled engine, igniting the air fuel mixture by the spark.

Over time a Spark Plug will become fouled because the air/fuel ratio may be set wrong, worn piston rings, carbon build up, and other factors.
It is best to replace a dirty spark plug, rather than trying to clean it.

It is important to gap your spark plug according to the owners manual of your product.
Frequently Purchased With
Compatibility

This part is compatible with the following machines:

Briggs and Stratton
Husqvarna
Toro
Expand the 150+ compatible machines
Questions & Answers

What are the exact specs for this plug. Can I use a Champion 71ECO/RC12YC as a replacement for my Briggs and Stratton lawnower?
Mary for model number 491055t spark plug asked on 2023-03-18
Hi Mary, Thank you for your question. The spark plug measures approximately 3 inches long by 3/4 inches wide. A Champion RC12YC would be a replacement for it. Part number RC12YC has been updated by the manufacturer to part number 71G. If you would like to place an order for it, please call our customer service line and anyone will be happy to assist you. We look forward to hearing from you!
eReplacementParts Team March 18, 2023
Will a BPR5ES or a BPR6ES spark plug work for the above model which is the better one to replace with?
Arthur for model number 104M020005F1 asked on 2022-08-12
Hi Arthur, Thank you for your question. The part number listed under your model number for the spark plug is 491055T. It is a BCPR5ES spark plug. If you need help placing an order for it, customer service is open 7 days a week and anyone will be happy to assist you. Please feel free to give us a call. We look forward to hearing from you!
eReplacementParts Team August 12, 2022
My operators manual lists engine parts by Model 80000, 90000, 093J00 and 100000. I can't figure out which one I have by the code on the engine.
Allen for model number 104M02-0223-F1 asked on 2022-06-22
Hello Allen, Thank you for contacting us. We have researched the model you have provided and have found the part you are looking for is Part Number: 491055T. If you need help placing an order, customer service is open 7 days a week. Please feel free to give us a call. We look forward to hearing from you!
eReplacementParts Team June 22, 2022
Repair Instructions: Submitted by Customers Like You
6 of 6 people found this instruction helpful
Tool Type:
Lawn Tractor
Parts Used:
Spark Plug - 491055T
Armature Magneto - 595304
Repair Difficulty:
Easy
Time Spent Repairing:
15-30 minutes
Tools Used:
Socket set, Wrench Set
Lawn tractor would not start, no spark at plug
1. Removed plastic engine covers.
2. Removed spark plug.
3. Connected spark plug to cable and placed on cylinder head for a ground path.
4. Cranked engine and observed no spark.
5. Removed shutoff wire from magneto and repeated (isolates any issues with other wiring), still no spark.
6. Install new magneto at farthest back position and snug the bolts.
7. Rotate flywheel until magnets align with magneto.
8. Place business card between magneto and flywheel.
9. Loosen magneto bolts and allow magnets to pull magneto to flywheel.
10. Tighten magneto bolts.
11. Remove card and rotate flywheel by hand to ensure there is no contact (will be very close)
12. Reinstall spark plug and connect wire.
13. Start and run for test, then reinstall engine covers.
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7 of 8 people found this instruction helpful
Tool Type:
Generator
Parts Used:
Spark Plug - 491055T
Carburetor - 809011
Repair Difficulty:
Easy
Time Spent Repairing:
1-2 hours
Tools Used:
Screwdriver, Socket set, Wrench Set
Generator had sat for oh 8 years. Carburetor was gummed/varnish up and inoperable, plugs fowled out so it was easier and time saving to replace the parts.
Removed the fly wheel cover the intake manifold then the carburetor, re-installed new carburetor re-installed manifold then the flywheel cover, squirt some oil in each cylinder installed the new plugs gapped at 0.030 choked carburetor then cranked oh 10 seconds then gave shot of starter fluid and hit the start switch again and within oh 3-5 seconds it started and I let it run for 10 minutes, now my 15kw generator is up and running I have no worries when loss of power comes my way now, lol, once again thank you eReplacement parts
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2 of 2 people found this instruction helpful
Tool Type:
Lawn Tractor
Parts Used:
Spark Plug - 491055T
Crankcase Gasket - 697110
Oil Seal - 795387
Oil Filter - 492932B
Intake Push Rod - 692003
Valve Gasket Set - 794152
Repair Difficulty:
Medium
Time Spent Repairing:
1-2 hours
Tools Used:
Screwdriver, Socket set, Wrench Set, Nutdriver, Feeler gage, spark plug gap tool
Intake push rod bent
I jumped the gun initially and pulled the engine from the tractor, thinking the connecting rod had broken. I should have checked the valve push rods first. That would have saved me the time of removing the engine from the tractor and replacing the pan gasket and crankshaft oil seal.
It was pretty simple after I determined that my problem was the push rods. I removed the bent rod installed the new one I purchased from eReplacementParts.com. Adjusted the valves(You can find several youtube videos to guide you through this procedure). The engine started right up and I mowed about two hours with it this weekend.
I wish I could tell you why the push rod bent, but I can't. If anyone has an explnation I would love to here it.
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Tool Type:
Engine
Parts Used:
Spark Plug - 491055T
Armature-Magneto - 796964
Air Filter Pre-Cleaner - 493537S
Carburetor - 798654
Repair Difficulty:
Medium
Time Spent Repairing:
30-60 minutes
Tools Used:
Pliers, Socket set, Wrench Set, Nutdriver
Wouldn't start.
Removed gas tank, carb, springs
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Tool Type:
Lawn Tractor
Parts Used:
Spark Plug - 491055T
Fuel Filter - 845125
Air Filter Cleaner Cartridge - 499486S
Pre Cleaner Air Filter - 273638S
Oil Filter - 696854
Repair Difficulty:
Easy
Time Spent Repairing:
30-60 minutes
Tools Used:
Screwdriver, Pliers, Socket set
Spring tune-up
Replaced air filter,oil filter, fuel filter and plugs. Runs like a top!!
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Tool Type:
Lawn Tractor
Parts Used:
Spark Plug - 491055T
Repair Difficulty:
Medium
Time Spent Repairing:
30-60 minutes
Tools Used:
Socket set, Wrench Set, Adjustable Wrench
John Deere D-105 would not start.
Changed starter and solenoid then adjust the valves. πŸ‡ΊπŸ‡Έ
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Tool Type:
Pressure Washer
Parts Used:
Spark Plug - 491055T
Air Filter Pre-Cleaner - 493537S
Key, Flywheel - 796335
Repair Difficulty:
Medium
Time Spent Repairing:
30-60 minutes
Tools Used:
Socket set, Wrench Set
Water pump was not working or didi not produce high presure.
The conecting pin or key between the motor and the pump was broken. It was replaced and it is working very ell.
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Tool Type:
Lawn Mower
Parts Used:
Spark Plug - 491055T
Filter-Air Cleaner Cartridge - 795115
Repair Difficulty:
Easy
Time Spent Repairing:
15-30 minutes
Tools Used:
Pliers, Socket set, None
Mower would start then stop or not start at all
Removed old fuel pump. Located on the top side of the engine
Replaced the spark plug
Replaced the old air filter
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Tool Type:
Generator
Parts Used:
Spark Plug - 491055T
Fuel Filter - 84001895
Tube Breather - 691556
Repair Difficulty:
Medium
Time Spent Repairing:
More than 2 hours
Tools Used:
Screwdriver, Pliers, Socket set, Wrench Set, Adjustable Wrench
repair of 10,000 generator motor
Portable generator had been sitting unused for some time. Disassembled motor components carburetor, gas tank. removed front cover and polished the magnetic flywheel and spark plug coils. disassembled the carburetor and cleaned installed new flow seat. replaced all tubing and installed new fuel pump. started and adjusted fuel settings. unit runs and charges as designed.
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Tool Type:
Engine
Parts Used:
Spark Plug - 491055T
Coil - 820037
Repair Difficulty:
Easy
Time Spent Repairing:
15-30 minutes
Tools Used:
Screwdriver, Socket set, Wrench Set
A service repair company removed the cover from the engine, and left it exposed in the elements for over 7 months.
Replacing damaged components, one at a time. Troubleshooting components to confirm damage, and ordering available parts through eReplacements.
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Reviews
4.7
Average Rating (out of 5):
20 Reviews
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  • Easy Peasy
    A friend brought his lawnmower to me for repair as it would not start. Installed new plug, carb and air filter and the machine started with one pull of the starter cord!
    Sharon - July 28, 2023 Verified Purchase
    Hard to find part
    I was pleased that your company handles parts that most stores discontinued. Fast shipping totally pleased with your service.
    Guest - June 22, 2023 Verified Purchase
    Easy to repair with the right parts
    I ordered the parts I needed and the repair went smoothly. The parts were delivered quickly and the my mower was running in minutes.
    Guest - May 18, 2023 Verified Purchase
    Good Service
    Good products at a good price. If need help the phone service is very helpful.
    Guest - January 5, 2023 Verified Purchase
    easy repair
    parts were as ordered. great fit. Mower running like new...
    Guest - November 26, 2022 Verified Purchase
    Replacement Spark Plug
    The part arrived quickly. It was the correct part. My lawn mower is working again.
    Guest - November 22, 2022 Verified Purchase
    Lawn mower spark plug
    Ive done business with ereplacement parts for many years. They have a great selection for just about any mower, string trimmer or blower. Since the majority of replacement parts are OEM, your assured it fits right at a competitive price. There is no one else that I have found with one stop shopping capability for all your gas or electric powered lawn tool repair parts. Give them a try.
    James - July 19, 2022 Verified Purchase
    The exact plug number I needed.
    Good plug.
    Guest - May 6, 2022 Verified Purchase
    Needed part
    Works great
    Guest - June 22, 2021 Verified Purchase
    Good price, all parts in stock, quick delivery, what more needs to be said!
    Good price, all parts in stock, quick delivery, what more needs to be said!
    Thomas - April 15, 2021 Verified Purchase
    Verified Purchase
    eReplacementParts Team
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    Product Information
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