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Briggs & straton 16.5 hp wants to start but will not keep running will not build up rpms and stalls

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  • cbrdisney1 Sep 10, 2010

    thank you for your comments i have done all this plus change fuel cap when i put fuel directely into air filter it will start but still will not build up rpm oil is full always has been and i clean no smoke comes out of exhaust has compression

  • cbrdisney1 Sep 10, 2010

    i have tryed all these things and changed fuel cap also good on oil no smoke plenty of compression

  • cbrdisney1 Sep 10, 2010

    i use this mower every week i took carb apart it is metal outside has a plastic diphram inside cleaned with carb cleaner i will get make and model and let you know

  • cbrdisney1 Sep 10, 2010

    i use this mower every week the carb is metal outside with a plastic daphram inside i cleaned it with carb spray everyplace i could find it is a 16.5 ic 500cc #081016ze9266 model 31a707-d525 b1 3081016ze

  • cbrdisney1 Sep 10, 2010

    di you get comments i sent around 3;30PM 9-10-10

  • cbrdisney1 Sep 11, 2010

    the info off th mower 081016ze92661 eng is ic 16.5 500cc more numbers 31a707d525b1 081016ze

  • cbrdisney1 Sep 15, 2010

    i was talking to you last week carb trouble b&s 16.5 mower i agree carb trouble question how do i remove the main jet on the nikki carb looks like it is next to fuel line thanks

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It sounds like a fuel problem. You might check your fuel filter. You can try spraying starting fluid in the air cleaner when it starts to stall. If it picks up rpm then it is for sure a fuel problem. It that is the case, it is more than likely a fuel filter. Could be a vacuum leak where the carb attaches to the cylinder, or bad gas. The carb could have a spec of dirt in the main jet. But the carburetors on Briggs are pretty simple. Also could be the fuel pump. I would check these things. If it is an electrical problem the mower usually doesn't start at all. So I am thinking that it is a fuel problem.

Posted on Sep 11, 2010

  • Rodney Clark
    Rodney Clark Sep 15, 2010

    I am sorry I did not get back to you faster. The little diaphram that you were talking about is the fuel pump. Does it look to be ok? Does it have any pin holes in it or torn in any way?

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This condition is typically caused by something restricting the main jet in the carb or old fuel. (much more than a month old, that is) I would drain the fuel system complete. Also, remove the bowl and clean that out as well. the bowl nut is actually the main jet and should be cleaned. A can of carb spray works nice and easy or compressed air will do. Let some fresh fuel run through it and possibly change the inline fuel filter ,especially if water or debris found.

Posted on Sep 10, 2010

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  • Jtemelcoff Sep 10, 2010



    Has this motor been sitting for along time? if it has then you may need to remove and clean the carb. As the old gas evaporates, it leaves behind all sorts of wax and other deposits and this clogs up all the tiny passages.
    The best way to clean a carb is either in a soak can or pay to have it cleaned ultra-sonically. If this has the Nikki carb with the plastic internals, I wouldn't even bother with it, I'd just go ahead and replace it.
    This carb may not have any adjustments. If you can give me the model and type numbers of the engine I can be more specific

  • Jtemelcoff Sep 10, 2010

    It looks like you are trying to leave me a comment, but I am not seeing anything. Did you get the #s off of the engine? i can give you a more concrete answer with the proper information.

  • cbrdisney1 Sep 15, 2010

    i spoke with last week re 16.5 briggs did everything you suggested except remove main carb jet how do o do this it looks like it is next to fuel line but no screw head or hex head ?????

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