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Trouble shooting a JD 212 lawn tractor.

Post in 'The Gear' started by smokinj, Jun 3, 2013.

  1. smokinj

    smokinj Minister of Fire

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    This is a friends tractor it run sweet for 20 mins then the only way it will run is with the choke on?

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  2. gzecc

    gzecc Minister of Fire

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    The carb need cleaning (probably). Get to the front of the carburetor, disconnect hoses, screws etc...and spray carb cleaning stuff in all the openings. I think I did this without removing the carb once. Do it a couple of times. Also add some seafoam to the gas tank and let it sit over night after running it. Could have something in the fuel line. Blow that back to the tank.

    If you want more serious help from a very experienced crowd go to weekendfreedommachines website
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  3. tekguy

    tekguy Feeling the Heat

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    last time my 110 (with 10hp kohler - almost identical to the 12hp) ran good cold and not hot, changing points and head gasket fixed it

    I think i paid like $35 for head gasket, carb rebuild kit and new points -head gaskets according to manual are to be changed yearly
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  4. Sprinter

    Sprinter Minister of Fire

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    You can try this first, but it's most likely the jets in the carb are plugged up and you'll have to remove the jets and clean them out. Usually the result of letting old gas sit in carb too long, which is common in seasonal use engines, but maybe just from debris like rust.
  5. tekguy

    tekguy Feeling the Heat

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  6. smokinj

    smokinj Minister of Fire

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  7. tekguy

    tekguy Feeling the Heat

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    you might fid something like this
    [​IMG]

    it would still start!
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  8. bogydave

    bogydave Minister of Fire

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    Another thing to check,

    Fuel pump gets warm, not pumping ?
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  9. smokinj

    smokinj Minister of Fire

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    I would just about bet on it. ;) Oh he is...lol I will let you know but he wants to replace either way.....
    Do you have a link for a jd service manual la 135??????
  10. MasterMech

    MasterMech Guest

    +1 on replacing the points and condenser on that old Kohler if nobody can remember the last time it was done. Gap is .020 on those IIRC? Also worth throwing a neon spark tester on it of the points are not the issue. Could be a marginal coil getting weaker as it heats up.

    Carburetor issues tend to improve as the engine reaches full temp rather than get worse. If you're 100% the ignition is ok, check the fuel lines, FILTER, and the pump. Don't forget to check the cap!

    With the symptoms described, after checking out the easy stuff, I would go straight to a cylinder leak-down test. Could be time for a rebuild.
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  11. pyroholic

    pyroholic Member

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    My dad's la170 was just doing that. It was a clogged breather hole in the gas cap. It would slowly build vacuum in the tank over about 2O min then stall when the fuel pump could no longer overcome the vacuum. Crack the cap, or wait a while and good for another 2O. No more problems after clearing clog. The choke helped too when it was acting up. Choking it was bringing the fuel/air ratio back to normal (or at least close) as the air was restricted to match the restricted fuel.
  12. Jack Straw

    Jack Straw Minister of Fire

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    Check the gas cap!
  13. smokinj

    smokinj Minister of Fire

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    Every thing thats been mention is already new or on its way. This is one really good example of a 212. New gas cap came in yesterday. It no longer showed how much gas was in it so thats was the reason it got replaced(But not the issue). Head gasket, points are on the way. Coil check by dealer but a new one is still on the way. This is more of a rehurb so if you can think of anything else feel free! Even the knobs and gauges are new. Makes me want one!
  14. tekguy

    tekguy Feeling the Heat

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    i dont have a link to the la135 manual, hell they want like $80 for it !!!

    i wouldnt mind a 140 or a 314 myself (a 318 would be awesome but those are $$ or any of the 400's)
  15. Jags

    Jags Moderate Moderator Staff Member

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    I didn't see it in the list. You gonna do a carb rebuild on that? The kits are pretty cheap.
  16. smokinj

    smokinj Minister of Fire

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    When he bought it the guy says it was rebuilt. By the looks of the bolts and screws I would say he telling the truth.
  17. Jags

    Jags Moderate Moderator Staff Member

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    It may be true, but I would still pull the carb down. I think that is your running issue.
  18. smokinj

    smokinj Minister of Fire

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    See what happens with the other parts first. If that dont handle it that will be next.
  19. Jags

    Jags Moderate Moderator Staff Member

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    Well, from your first description...After 20 minutes you have to pull out the choke and then it runs relatively normal... that ain't spark...thats fuel. But it sounds like the dude is doing a full resto - so it probably ain't a big deal. He will get to it eventually.
  20. smokinj

    smokinj Minister of Fire

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    Does not run normal kind of spits and sputters. Runs perfect though even while mowing and that 20 min mark just turns into a puck machine.
  21. Jags

    Jags Moderate Moderator Staff Member

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    Well, could be spark then.
  22. smokinj

    smokinj Minister of Fire

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    Got a feeling it will look something like post 7.
  23. MasterMech

    MasterMech Guest

    Old 200 Series GT's are beasts. That transmission is bombproof. And y'all already know how I feel about K-Series Kohlers. ;)

    Head gaskets that are blown that bad will be quite obvious while cranking or right when the engine starts up. If you can hear it "whiffing" then you know. Also that will affect it warm, hot, or cold so I think you're ok there. Check that head for true if you do pull it off. Also check for lateral play in the piston by pushing it around a bit. If it moves visibly, then it's worn, but these engines can tolerate a LOT of imperfection. ==c

    Running issues like you describe that are 20 mins in are usually vacu-locked fuel systems (bad cap) or compression issues. (worn rings, leaking valves etc.)
  24. Jags

    Jags Moderate Moderator Staff Member

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    I have also seen where valves heat and start to stick, but admittedly not on the K series Kohlers.
  25. Adios Pantalones

    Adios Pantalones Minister of Fire

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    My Cub has an 18hp Kohler that liked to have the choke on all the time. I recently blew out the fuel line, lubed the choke cable, and a couple other things, which fixed it. I think there was something sucked into the end of the fuel line where it meets the tank that caused a restriction- blew it out by mouth.

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