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-   -   18.5 hp Briggs and Straton (https://www.askmehelpdesk.com/showthread.php?t=212427)

  • May 4, 2008, 09:28 AM
    oldschooldad
    18.5 hp Briggs and Straton
    I have a lawn mower with an 18.5 thatstarts but blows gas up through the carb. It runs but not good.
  • May 4, 2008, 10:25 AM
    ballengerb1
    I think you may have an intake valve that's not totally closing. Can you do a compression testr and come back with some numbers?
  • May 5, 2008, 10:17 AM
    MOWERMAN2468
    Valves out of adjustment, or carb needs cleaning or adjusting.
  • Jul 6, 2009, 01:55 PM
    tarrbaby

    Had same problem install in line fuel cut off close valve run carb dry,, then open valve and restart, close valve when not in use
  • Jul 6, 2009, 06:05 PM
    krazziee

    I am going with the intake valve open, it is stuck open or it has burned itself or the head

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