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  1. #1

    Join Date
    Jun 2012
    Posts
    1
    Location
    Georgia
    Mower
    briggs & stratton 300 series

    problem with my Briggs & Stratton 300 series

    model # 961140014 05 runs, but not smooth. It runs high then low, high then low continuously; like it wants to shut off

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  3. #2

    2,500 Post Club

    Join Date
    May 2010
    Posts
    2,602
    Location
    Illinois
    Mower
    kioti/rhino finish mower

    Re: problem with my Briggs & Stratton 300 series

    Either the carb needs cleaned or if it has the two spring governor system, then springs may need adjusted to syncronize them
    ILLINOIS ENGINE, BEECHER CITY, IL
    BRIGGS AND STRATTON MST (MASTER SERVICE TECHNICIAN)
    Sales and Service for Dolmar, Poulan, Briggs and Stratton, Kohler, Lauson(Tecumseh, LCT), Generac, Brute.
    Warranty service for MTD, Murray, Powerwasher, Karcher, Mcculloch, Earthwise, Earthquake, Yamaha engines, Hisun, American Sportsworks, Worx, Rockwell Tools, Great Lakes Technologies products(Wen, CZ), Efco, Snap-On pressure washers, and others.

  4. #3
    doug9694's Avatar
    Join Date
    Nov 2014
    Posts
    11
    Location
    Michigan
    Mower
    11 Hp Craftsman, 6,25 Briggs self propelled

    Red face Re: problem with my Briggs & Stratton 300 series

    The problem with these carbs are they are plastic. Over time they form a gap under where the carb slides on the intake tube.
    This causes too much gas to go directly into the engine causing rough running. I have seen such wide gaps that the otherwise good diaphragm gets folded in and is ruined in some cases. I have reused them by putting a weight on them over night to flatten it back out. I have tried filing the carb flat. that did not work.
    The fix I used is to put two long studs in. One on each side, and a bent 1/8" x 1/2 thick bar with a hole that goes on the stud and screw a nut down till you see the gap closing. Let it set awhile and screw down some more as the carb takes a set.
    Then screw a nylock nut on the first one. The mower ran like new when I put the carb back on. Cut any extra off the studs so they don't interfere with the air cleaner.

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