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  1. #1
    Bronze Member
    Join Date
    Nov 2009
    Posts
    87
    Location
    Kansas
    Tractor
    2009 John Deere 4720

    Default Small Engine Help

    Someone was kind enough to give me a trail mower with an 8hp B&S engine on it. The unit is in excellent condition overall, with new blades. I was excited, and anxious to mow some trails that my tractor and brush cutter won't make it through.

    I put new gas in it, the oil looked good, and the plug looked good. I started it up, and it started on the first pull. The engine seemed to sputter a little, and would not rev much above idle. I let it warm up a while, and tried to work the throttle, but still just a little above idle. When I engaged the blades, the motor shut down, and would not restart, I'm thinking that the carburetor is gummed up.

    Anyone have any advice on how to troubleshoot this problem?
    John Deere 4720
    400 CX Loader
    Polaris Ranger 800XP

  2. #2
    Platinum Member
    Join Date
    Mar 2006
    Posts
    614
    Location
    BEECHER CITY, IL
    Tractor
    KIOTI DK45S

    Default Re: Small Engine Help

    Here are some possibilities, the throttle plate on the carb is stuck shut, the governor spring is out of adjustment or broken, the intake lobe of the camshaft is worn close to round, or the main carb jet is clogged.

  3. #3
    Bronze Member
    Join Date
    Nov 2009
    Posts
    87
    Location
    Kansas
    Tractor
    2009 John Deere 4720

    Default Re: Small Engine Help

    Thanks for the advice - I was pretty sure the problem was carb/fuel related, just didn't know where to start. I'll see if any of the quick-fix items are the source of the problem before I take the carb off for a rebuild.
    John Deere 4720
    400 CX Loader
    Polaris Ranger 800XP

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