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9 HP Briggs problem

Post in 'The Gear' started by jimdeq, May 16, 2011.

  1. jimdeq

    jimdeq Member

    Joined:
    Apr 23, 2010
    Messages:
    205
    Loc:
    northeastern wisconsin
    My very old 9 HP briggs engine keeps fouling sparke plugs. It started running rough so I shut it off,then went to restart and it wouldnt. Put in new plug and it started and ran for about 4 hours and then the same thing happened. Whats Up?

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  2. Corey

    Corey Minister of Fire

    Joined:
    Nov 19, 2005
    Messages:
    2,120
    Loc:
    Midwest
    Burning oil, carb being too rich and/or the choke stuck on are the main reasons for fouling plugs.
  3. Jags

    Jags Moderate Moderator Staff Member

    Joined:
    Aug 2, 2006
    Messages:
    14,597
    Loc:
    Northern IL
    Yep, if you are fouling plugs, it means that you are introducing something it can't get burned up. It could be in the form of oil or too rich on the carb, although I would expect it to really run like crap if it is rich enough to foul a plug in 4 hours. Sounds to me like it is valve guides or piston rings introducing oil vapor.
  4. DexterDay

    DexterDay Guest

    X2.... On That One.. Some people don't believe in Marvel "Mystery Oil" or other Products like "SeaFoam" or STP makes a few... These products try to "Re-Seal" Wear-Fit parts.^ ( Rings, Valve Guides) ^..But depending on how old your motor is, and how much you want it to quit burning oil "Cheaply". I would try one before dropping a Big Dime on a Rebuild.

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