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Frequently Asked Questions

To search the Frequently Asked Questions (FAQs), enter your search terms or questions in the box below. Not sure what to search for, browse by category by clicking the Browse tab. If you still need help, you can submit your question by clicking the Ask a Question tab. Our Answer Center will respond to your question within 3 business days.

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Engine's RPM Seems to Fluctuate (Runs Rough)

Why does my engine's RPM seem to fluctuate (runs rough)?

Many engine performance problems can be linked to maintenance issues such as stale fuel, dirty air filter, fouled spark plug, and deteriorated oil.

A great way to help avoid these problems would be to perform an annual tune-up using a Briggs & Stratton engine Maintenance Kit.

Engine hunting and surging at idle is usually caused by a fuel delivery, air leak, or governor system problem. Cleaning/overhauling the carburetor, adjustment of the governor, and/or changing the air filer may be required.

For an example of how an engine sounds while hunting and surging, please listen to the example provided here:


For additional information regarding poor engine performance, please visit the Troubleshooting section of our website.


B&S Repair Manuals contain common specifications and detailed, easy-to-follow instructions on how to perform adjustments, tune-ups and repairs.

If you wish to perform this maintenance yourself, a good source for engine specifications and technical servicing information would be a Briggs & Stratton Repair Manual (Lookup Manual by Engine Model.) The correct Repair Manual for your model engine is often listed in your engine's .

Repair Manuals are available for purchase through our websites Learning Resources section or locally from a Briggs & Stratton Authorized Dealer.

For your convenience, Do-It-Yourself parts and products related to this and other maintenance/repair issues such as air filters and carburetor parts may be ordered through our Maintenance Parts & Accessories section.

Your will provide component part numbers specific to your engine's Model, Type, and Code that you may require.



Your best source of information regarding any engine concern would be a Briggs & Stratton Authorized Dealer. Your Briggs & Stratton Authorized Dealer has all the information relating to Briggs & Stratton warranty information, replacement engines, short blocks, parts, pricing, service/repair, specifications, etc.

For your convenience, we offer three easy ways to locate your nearest Briggs & Stratton Authorized Dealers:

  • Use our website's Service Center Locator.

  • Visit www.yellowpages.com and enter "Lawn Mowers" or "Engines-Gasoline" in the Category search field and your Postal Code in the Location search field.

  • Call the Briggs & Stratton Automated Hotline at (800) 444-7774. This hotline is available 24 hours a day/7 days a week and features voice recognition technology to assist you in finding the Briggs & Stratton Authorized Dealers in your area. Automated maintenance tips, product information, and FAQs are also offered through voice activated menus.



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Our user community provides a place for users to ask and answer questions of one another. Our staff also participates in this community on a regular basis. Please note that your question may take more than 24 hours to appear. If you are in need of an immediate answer please review our frequently asked questions or contact a local service dealer .

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Please complete the form below to contact us with your question. Provide as much information as possible. We make every effort to personally answer all questions within 3 BUSINESS days. If you are in need of an immediate answer please review our frequently asked questions or contact a local service dealer.

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  • Enter any equipment model numbers you may have


  • Look for STAMPED B&S ENGINE NUMBERS


    STAMPED - YYMMDDxx Identifies Manufacture date


  • 5HP=5, 18-1/2=18.5, 25=25.00


    Series (3 digits) or Torque (ft. lbs)


  • Quantum, Intek, Classic, Sprint, etc.


    Manufacturer of the Tractor, Generator, Lawn mower, etc.


  • What kind of product is the engine coupled to?


    Where was the equipment purchased?


  • When product was purchased. Format: mm/dd/yyyy.

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  • Zip + 4 xxxxx-xxxx Canada use xxx xxx format




  • format: xxx-xxx-xxxx  




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