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Frequently Asked Questions

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Poor Performance in High Altitudes

At what altitude should I remove the main air bleed?

If your engine is operating above sea level and you are experiencing rich running conditions (fouled spark plugs, hard starting, etc.) you may need to adjust the carburetor. This is due to the lower than normal oxygen levels at higher altitudes (typically, anywhere between 3,000 to 4,000 feet above sea level).

Please note that engine power will decrease 3-1/2% for each 1,000 feet (300 meters) above sea level and 1% for each 10° F (5.6° C) above 77° (25° C).

Your best source of information would be to consult a Briggs & Stratton Authorized Dealer.

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

  • Use our website's Service Center Locator.

  • Visit 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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