Medium
30-60 minutes
This replacement spark plug is a genuine OEM item that is used with Briggs and Stratton engines. A spark plug delivers electric current from an ignition system to an internal combustion engine. After time spark plugs will become dirty or fouled eventually requiring replacement. This high quality item is sold individually. You should gap your spark plug according to the owners manual of the outdoor product you have.
Plug-spark 591868
OEM part for: Briggs & Stratton Engines, Troy-Bilt
Part Number: 591868
$4.99
In Stock
Ships within 1 business day 
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Compatibility
This Plug-spark will fit the following 5917 machines. Confirm this part works with your model, and view the detailed model diagrams and repair help we have to offer.
This item works with the following types of products:
- Lawn Mower Parts
- Engine Parts
This part replaces obsolete part #: 799876
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Great service
The process was cleared for a problem I experienced with online with the assistance of a customer rep. The items claim quicker than I thought they would. Excellent quality parts also.
Ralph -
June 23, 2022
Verified Purchase
OG part
It’s a spark plug. Did it’s job
Guest -
June 20, 2022
Verified Purchase
perfect part
The part arrived fast,and it worked perfectly for the mower,I will be ordering more parts as needed,Thanks
Leslie -
May 1, 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.
Toro mower was hard starting. After finally starting with sarter fliud, engine soon dies out.
Kelvin - August 28, 2016
👍 3 of 4 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Medium
Time
1-2 hours
Tools Used
Screwdriver, Pliers, Socket set
1. Remove top cover.
2. Remove air filter cover and cartridge.
3. Drained fuel then removed old fuel line.
4. Used carburetor cleaner to clean carburetor, spraying fuel inlet and choke.
5. Installed new fuel line with filter. (old fuel line did not have a filter)
6. Installed new air filter with cover.
7. Remove and installed new spark plug gapped it at 0.030.
8. Replaced top cover.
9. Fill fresh, non-ethanol fuel.
10. Crank till start.
2. Remove air filter cover and cartridge.
3. Drained fuel then removed old fuel line.
4. Used carburetor cleaner to clean carburetor, spraying fuel inlet and choke.
5. Installed new fuel line with filter. (old fuel line did not have a filter)
6. Installed new air filter with cover.
7. Remove and installed new spark plug gapped it at 0.030.
8. Replaced top cover.
9. Fill fresh, non-ethanol fuel.
10. Crank till start.
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Mower needed a new spark plug.
Joseph - August 19, 2021
Tool Type
Lawn Mower
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver, Socket set, none
Parts Used
removed old plug; inserted new plug; tightened new plug
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Hard starting and poor performance once finally running
Philip - September 14, 2018
Tool Type
Lawn Mower
Difficulty
Medium
Time
More than 2 hours
Tools Used
Screwdriver, Pliers, Socket set, Wrench Set, Carb cleaner spray
Removed old spark plug, correctly gapped and re-installed new spark plug purchased from e-replacementparts.com.
Removed old, dirty air filter, airbox assy. and gummed-up carburetor from engine. Dis-assembled airbox and carb completely - cleaning all the parts thoroughly with carb cleaner spray.
Re-assembled freshly cleaned carb with new carb overhaul kit from e-replacementparts.com.
Re-installed overhauled carb and airbox assy. back onto engine. Re-installed new air filter purchased from e-replacementparts.com and adjusted carb to specs.
Lawnmower engine now starts easily and has plenty of power!
Removed old, dirty air filter, airbox assy. and gummed-up carburetor from engine. Dis-assembled airbox and carb completely - cleaning all the parts thoroughly with carb cleaner spray.
Re-assembled freshly cleaned carb with new carb overhaul kit from e-replacementparts.com.
Re-installed overhauled carb and airbox assy. back onto engine. Re-installed new air filter purchased from e-replacementparts.com and adjusted carb to specs.
Lawnmower engine now starts easily and has plenty of power!
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Lawn mower would not run.
Harvey - May 2, 2016
👍 1 of 2 people found this instruction helpful
Tool Type
Lawn Mower
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, Pliers, Socket set
Check flywheel key, remove spark plug and air cleaner. Replace gasket between air filter holder and carburetor. Replace spark plug and gap at 0.30
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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.
