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Spark Plug

Part Number: 491055S
Briggs and StrattonHusqvarnaToroLawn BoyVanguard - Briggs & Stratton
Availability: 25+ in stock
Price: $4.37
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*This part replaces obsolete part #: 594056 ((Resistor)), 491055s, 491055, 72347GS and 72347.

Product Information
Manufacturer: Briggs and Stratton, Husqvarna, Toro, Lawn Boy, Vanguard - Briggs & Stratton
Product Number: 491055S
Classification: Part
Weight: 0.05 lbs.
Shipping: Ships Worldwide
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.
Compatibility

This part is compatible with the following machines:

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

This item works with the following types of products:

  • • Engine
  • • Generator
  • • Lawn Mower
  • • Lawn Tractor
  • • Pressure Washer
Questions & Answers

why do this spark plug come untorque lawn tractor 491055t plug
ambrose
Hello Ambrose, Thank you for the question. The Spark Plus is used on more then one model and some models will have different torque settings, so the the plus may not come set to the torque needed on your model and will require an adjustment. Hope this helps!
What is the difference between Briggs & Stratton 491055T and 491055S, spark plugs for a Craftsman lawnmower?
Mike
H Mike, Thank you for your question. Part number 491055S replaces part number 491055T. I hope this helps. Thank you and have a great day!
Repair Instructions: Submitted by Customers Like You
6 of 6 people found this instruction helpful
Tool Type:
Lawn Tractor
Parts Used:
Spark Plug - 491055S
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 - 491055S
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 - 491055S
Crankcase Gasket - 697110
Oil Seal - 795387
Oil Filter - 492932S
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 - 491055S
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 - 491055S
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 - 491055S
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. 🇺🇸
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Tool Type:
Pressure Washer
Parts Used:
Spark Plug - 491055S
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 - 491055S
Fuel Pump - 597338
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 - 491055S
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 - 491055S
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
4.2
Average Rating (out of 5):
9 Reviews
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  • GREAT SERVICE
    After I placed my order I was expecting a long wait but to my surprise I received my spark plug in just a few days. Great service!
    Guest - April 11, 2020 Verified Purchase
    easy repair
    The plugs came in great shape and pre gapped. Inserted into engine and engine works smoother with more power.
    Guest - October 24, 2019 Verified Purchase
    Great park fast shipping
    Enjoyed the shopping experience. If you ever need a part for anything replacement parts.com is the place to go.
    Gary - July 24, 2019 Verified Purchase
    Easy repair
    All parts work great and generator runs like new
    Guest - July 13, 2019 Verified Purchase
    As described
    As described
    Guest - June 8, 2019 Verified Purchase
    worked good
    MY LAWN MOWER IS RUNNING GOOD
    Guest - May 7, 2019 Verified Purchase
    Ordered multiple parts
    Parts all fit fine, only negative is how long it takes to get anything. For their part they do tell you it could take eight days before they ship as parts are being sent to them from warehouses.
    Glenn - April 26, 2019 Verified Purchase
    Receipt of Dec. 5, 2019, & Dec. 12, 2019, Orders.
    Received the spark plug quickly, but still awaiting the remainder of my order. i.e.,
    Guest - December 31, 2019 Verified Purchase
    Briggs & Stratton Spark Plug is just OK
    For being a Briggs & Stratton spark plug, specifically for my mower, this is just okay. after a full tune up. The new plug fires, but is not super sparky hot. It still takes several turns of the engine to fire off. My old Champion plugs fired better!
    CHRISTOPHER - July 29, 2019 Verified Purchase
    Verified Purchase
    eReplacementParts Team
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    Product Information
    Manufacturer: Briggs and Stratton, Husqvarna, Toro, Lawn Boy, Vanguard - Briggs & Stratton
    Product Number: 491055S
    Classification: Part
    Weight: 0.05 lbs.
    Shipping: Ships Worldwide
    Repair Guides
    Watch the Repair Video for Spark Plug
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