Briggs Rpm Adjusting

Briggs and Stratton Adjusting Governor 3.5HP

Learn how to adjust the RPM on a Briggs & Stratton lawn mower, this will fix a mower which is revving too low or too high. This is accomplished by adjusting the governor spring.

Tools/Parts:

    • Phillips Head Screw Driver
    • Flat Head Screw Driver
    • Needle Nose Pliers


Step 1

Remove the bracket holding the throttle cable in place. Remove the air filter with a flat head screw driver.

Step 2

If the mower is idling at lower than normal RPM tighten the governor spring by cutting it shorter, this will increase the tension on the throttle and raise RPM. If the mower is idling at higher than normal RPM stretch the governor spring slightly to decrease the resistance placed upon the throttle.

Step 3

After adjusting the governor spring to the desired amount of resistance test the lawn mower (with or without the air filter, if testing without air filter only test briefly). if everything is now working replace the air filter and throttle cable bracket.

9 Responses to “Briggs and Stratton Adjusting Governor 3.5HP”

  1. I spent more than an hour trying to find info to work out what sort of tension I needed on both springs from the Briggs and Stratton site (some-one had put the throttle spring onto a random hole in the plastic [rocker] arm). your tutorial was a nice and simple explanation/example of what it does and what I need to aim for – thanks!

  2. Thanks a clear explanation.
    Looking at the trees in the background and the
    practical instructions ,,,must be an Aussie.

  3. Why not just move the speed adjustment lever (the thing that the spring is hooked to) instead of bending up the spring ? It moves to release or increase tension on the spring.

  4. Measure spring twice. Cut it once. Or, why cut it at all? Letmesee what we’ve got goin on here. Be bk w you in a minute or two. Thanks in advance.

  5. Thank you it appears one spring was attached to the wrong thing thank you great help

  6. Go to briggsandstratton.com/eu/en/support/faqs/adjusting-the-governor

    To reset the governor: Loosen the nut that clamps the governor arm to the governor rod. Turn the governor rod toward the full throttle direction until it hits a stop. Hold it there, and tighten the nut again.

    Adjust the top no-load speed by bending the tang that the spring connects to.

    Do not adjust by cutting or stretching the spring. Buy a new spring if necessary.

    • A couple of things here to point out. One, the governor may not be an internal one, but an external plastic vane around the flywheel. In a perfect world, an engine governor will evenly match rpm for load required, up to its load limit. On most mower engines, its a much coarser slide than on some finer equipment. The gist of the governor on mowers is to simply push the throttle open more when a load hits it, most noticeably the blades being engaged. And the happiest medium you can get for the design, is for the engine to operate within a specified optimum range. Everything down to the camshaft design centers around top performance within just a few hundred rpms.

  7. Helped a lot, thanks.

  8. Clear instructions thanks
    Regards Steve Close

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