19 hp B & S engine speed problem

Discussion in 'Mechanic and Repair' started by deere-crazy-1, Apr 23, 2006.

  1. deere-crazy-1

    deere-crazy-1 LawnSite Member
    Posts: 4

    I have a 19 hp Briggs & Stratton that just started speeding up while I was mowing without moving the throttle. At half throttle it is running about as fast as it used to run with the throttle at full speed. Any ideas what the problem is?
     
  2. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,023

    Sounds like one of two things, The throttle cable slid in the hold down or the governor needs to be adjusted. Check the cable first then post back for the gov. adjustment if needed.
     
  3. lucforce

    lucforce LawnSite Member
    Posts: 223

    Hmm... sure hope the governor gear didn't give up.
     
  4. deere-crazy-1

    deere-crazy-1 LawnSite Member
    Posts: 4

    The cable seems to be tight and the gov. seems to be working. I think the gov lever might have slipped on the shaft. What is the proper procedure for adjusting the gov.?
     
  5. oldrustycars

    oldrustycars LawnSite Senior Member
    Posts: 301

    loosen the arm on the governor shaft. hold the carb wide open, and twist the governor shaft the opposite direction all the way. tighten it up. i would absolutely check for proper RPM under no load after doing this. 3600. if you dont have a tach, get one...its cheap and good to have.
     
  6. lucforce

    lucforce LawnSite Member
    Posts: 223

    " hold the carb wide open, and twist the governor shaft the opposite direction all the way"

    NO! Turn the governor shaft the SAME direction that you twist the gov lever to hold butterfly open. With the engine NOT RUNNING.
     
  7. oldrustycars

    oldrustycars LawnSite Senior Member
    Posts: 301

    my bad....you're right. i twist the shaft gently both ways, so that it moves freely in the arm, so you can feel it stop in both directions. thanks for the catch.
     
  8. lucforce

    lucforce LawnSite Member
    Posts: 223

    No problem.

    My ears always perk up when someone is getting instructions on governor adjustment. I have seen too many engines "singing" because someone was "adjusting" or had "adjusted" a governor.

    :drinkup:
     
  9. deere-crazy-1

    deere-crazy-1 LawnSite Member
    Posts: 4

    Thanks for your help, I'm waiting for a tach and time to work on it.
     
  10. oldrustycars

    oldrustycars LawnSite Senior Member
    Posts: 301

    briggs and stratton part # 19200, its about 23 bucks now. also consider the Tinytach that Restrorob did a post on recently, they stay on the machine, and include an hour meter. that would be best, then you'll always know your service intervals.
     

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