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    maxjr758's Avatar
    maxjr758 Posts: 4, Reputation: 1
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    #1

    Apr 29, 2010, 08:55 AM
    Briggs 12.5 hp surges
    12.5 briggs engine on riding mower .\r\nengine starts and runs , but surges, if I I run it with the choke out just a tiny bit ,it run smoothly. Tryen adjusting the carb ,no effect I replaced the air fiter ,same result
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
    		  
    #2

    Apr 29, 2010, 09:01 AM

    How many adjustment screws did you find on the carb?
    maxjr758's Avatar
    maxjr758 Posts: 4, Reputation: 1
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    #3

    Apr 29, 2010, 09:28 AM

    Just one
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
    		  
    #4

    Apr 29, 2010, 09:58 AM

    Should be 2, idle speed and mixture. Check the base of the barb. How to Adjust a Briggs & Stratton Carburetor | eHow.com
    maxjr758's Avatar
    maxjr758 Posts: 4, Reputation: 1
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    #5

    Apr 29, 2010, 08:41 PM

    Thanks 1 I'll check it out
    crigby's Avatar
    crigby Posts: 4,343, Reputation: 107
    Outdoor Power Equipment Expert
    		  
    #6

    Apr 29, 2010, 08:45 PM

    Hi,
    Newer models only have slightly effective low speed adjustment. The EPA guidelines are clear; if you can make it fail, then do. The adjustments went with that.
    You have a dirty main jet circuit or passage to the low speed jetting that causes this. A carb cleaning is in order.
    Peace,
    Clarke
    maxjr758's Avatar
    maxjr758 Posts: 4, Reputation: 1
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    #7

    Apr 29, 2010, 08:52 PM

    Thanks clark that's probably it as I took this carb off a old mower. Any pointers on cleaning this carb. It does just have the one ajustment.
    crigby's Avatar
    crigby Posts: 4,343, Reputation: 107
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    #8

    Apr 29, 2010, 08:57 PM

    Hi,
    Link attached is the manual:
    http://www.mymowerparts.com/pdf/Brig...20STRATTON.pdf
    Peace,
    Clarke
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