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Mower runs rough after about 4 hours

Discussion in 'Mechanic and Repair' started by towtruck212, Apr 20, 2010.

  1. towtruck212

    towtruck212 LawnSite Member
    Messages: 182

    I have a 17 HP Kawi. on a scag 52 hydro and it runs good for the first few hours of the day and then it starts to run like its on one cylinder and if you let it set for a few it will run good again. I am thinking the coils but just wanted to get any opinions before i start throwing parts at it....

  2. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029


    When the engine starts running bad remove each plug wire one at a time with rubber handled pliers, If you pull one off and the engine shuts down the coil on the other side is bad. If the engine doesn't shut down pulling the plug wires your problem lays else where.

    Can you post the model AND spec numbers off the bar code label on the engine block ?
  3. Mickhippy

    Mickhippy LawnSite Platinum Member
    Messages: 4,274

    Try a new fuel filter!
  4. GlynnC

    GlynnC LawnSite Senior Member
    Messages: 913

    Are you by chance pulling a vacuum in the gas tank? Loosen the gas cap when it starts missing to see if that makes a difference?
  5. nepatsfan

    nepatsfan LawnSite Gold Member
    Messages: 3,142

    work half days :drinkup:

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