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Briggs 18 backfiring, slow acceleration

Discussion in 'Mechanic and Repair' started by shopteacher, May 7, 2006.

  1. shopteacher

    shopteacher LawnSite Member
    Messages: 60

    Hey experts,
    I am a shopteacher, trying to teach a class on this stuff, need some help. I have a Briggs 18 horse, just rebuilt the carb, didn't replace the seat. I am getting slow acceleration, a little bit of a rough idle, and most of all,
    Backfiring out of the carb when I accelerate.
    This mower was abused, but runs well at times and doesn't smoke at all.
    I will list a few ideas, and you all can reply by numbers. How efficient!!

    1. Rebuild carb again, clean it better
    2. Carbon inside head, remove head, and clean thoroughly
    3. Valve adjustment needed.
    4. Don't be too picky, Briggs runs a little rough anyway.
    5. Be happy it runs as good as it does.
    6. Get a different carb, something could be wrong with this one.
    7. Do a compression test, maybe a leakdown test.
    8. What the heck are you doing teaching this class, you're an idiot with the intelligence of a bag of popcorn.

    Thanks, and be honest :)
  2. oldrustycars

    oldrustycars LawnSite Senior Member
    Messages: 301

    7. also, go back and read the first thread in this forum. we need the model, type, and code from the engine. myself, i'd like to see a leakdown test. i always do that FIRST, no matter what. if i get bad leakdown, no sense fiddling with the carb. i like to see no more than 15 percent, ideally bringing that up to 10 percent wet.
    after you get those numbers, and the leakdown readings, report back and we can get a good idea whats wrong.
  3. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    Hey Greg, I kinda like #8 myself. ;) :laugh: :laugh: :laugh: J/K , Numbers will be helpful.
    And Welcome to Lawnsite.....
  4. shopteacher

    shopteacher LawnSite Member
    Messages: 60

    I will do the leak down test.
    Oh, by the way
    9. Buy a new one.

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