L120 John Deere runs then dies

Discussion in 'Tractors' started by jpz1598, Nov 14, 2007.

  1. jpz1598

    jpz1598 LawnSite Member
    Messages: 2

    I have a john deere L120 tractor with a Briggs and Stratton 20 hp vtek twin engine. The problem i'm having is it runs good mowing for about 15 minutes till it gets hot and then it starts to sputtor and finally dies. Its helps for about a minute before it dies if i put the choke on full. I wait for a few minutes and try to start it again it will start and only run for a minute on full choke then die out again. As soon as i try to move it off full choke it dies right away. It runs great the after it completely cools off and then 10 minutes later when it heats back up it does the same thing. Any suggestions would be greatly appreciated. I put new gas and a new fuel filter on it. It has a fairly new air filter in it also.
  2. casco73

    casco73 LawnSite Member
    Messages: 246

    It sounds like a carb / jetting problem
  3. jpz1598

    jpz1598 LawnSite Member
    Messages: 2

    That what i'm thinking more and more, yesterday I couldn't even get it to stay running even when it was cold. Is there any easy way to clean the carb besides taking it all apart? Just wondering.
  4. 04superduty

    04superduty LawnSite Member
    Messages: 60

    pinched fuel line or possibly air in the lines?
  5. casco73

    casco73 LawnSite Member
    Messages: 246

    Carb and choke cleaner or gas additive spend like five bucks see what happens. How many hours does the machine have? After an x amount of hours these sevices need to be done like jetting cleaning and such. Also take the air cleaner off and see if you can see the the choke valve I believe its called the butterfly but while its open check to see if there is any black biuld up any where inside if so you need to clean the trottle body it needs to be completly clean to run properly
  6. NJDeere

    NJDeere LawnSite Member
    Messages: 21

    Loosen the fuel cap, the vent may be plugged, causing a vacumm in the fuel tank. If so, clean it or get a new cap.
  7. loom-gen

    loom-gen LawnSite Member
    Messages: 150

    Take the throttle body off, Take the carb off, Take the bowl off, Then spray the thing with carb cleaner in every little hole. now hit it with compressed air. Put the carb back together and back on the engine. It is simple. don't be chicken. the jets are clogged with dust and the air will dislodge the particles and open the jets.
  8. Sammy

    Sammy LawnSite Bronze Member
    Messages: 1,734

    Or, it may be a bad coil ?
  9. wjjones

    wjjones LawnSite Member
    Messages: 3

    Could be a bad fuel tank/ gas cap too.

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