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32" Toro, 12.5 Kohler - Carb issue?

Discussion in 'Mechanic and Repair' started by toac, Sep 28, 2012.

  1. toac

    toac LawnSite Senior Member
    Messages: 349

    I'm getting frustrated and I need some help.

    My Toro mower is giving me some trouble. It started several weeks ago. I would be cutting and all the sudden it would want to die. I would bump it up to full choke for 15 seconds, then put it back to normal choke and it would be fine. Then after a couple of weeks, it would start, but when i engaged the blade it would start to stall out. Now, when i start it up, it will die after about 15-30 seconds at full choke. If I try to move it from full choke to normal choke, it dies right away.

    I asked for some advice from some of my mechanical buddies and they said the carb probably needed to be rebuild...so I ordered the parts, rebuilt the carb and this is what I get:


    It's doing the same thing. Does anyone have any advice or idea what could be going on?

    Any help is appreciated.


  2. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029


    Sounds like you have a lean running engine, If the choke is FULLY closing that thing should be running like crap and bellowing out black smoke.

    Drop the float bowl and make sure you have ample fuel flow through the supply port (around float valve), Also make sure the main jet and emulsion tube are fully open. I wouldn't think it would be a plugged gas cap vent restricting fuel flow since it's not choking down/blowing black smoke on start-up.....
  3. MWHC

    MWHC LawnSite Member
    from Wyoming
    Messages: 218

    I have the exact same mower with the same engine and the same problem. I think I cleaned the Carb about 10 times trying to solve the problem. I never could make it run right. Sometimes the choke will get stuck in a position on that carb. I also dont think you can replace the carb. It is not available.

    I solved this issue by replacing the motor with a Kohler 15hp. You should see it mulch up leaves now!

  4. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    On the contrary they are, Just a random look-up since no spec number was posted; http://tewarehouse.com/1285345-S
  5. toac

    toac LawnSite Senior Member
    Messages: 349

    I've tried dropping the float bowl and re-cleaning the carb and I'm still having the same issue. Guess I'll have to buy a new carb.....:cry:
  6. piston slapper

    piston slapper LawnSite Platinum Member
    Messages: 4,335

    As RestroRob stated earlier..clean the main jet and emulsion tube...
    Also make sure the fuel inlet isn't clogged..with the bowl removed and the float down see if gas is getting into the carb....if the bowl nut has a hole in the top and on the sides..make sure they're clear...if the jet is screwed into the side of the maintube that the float goes around...make sure its clear...
    Posted via Mobile Device
  7. toac

    toac LawnSite Senior Member
    Messages: 349

    Alright, I finally had some time and installed a new carb. Started her up on the first pull, which is weird after sitting all winter, but none the less....still the same issue. Any idea on what else it could be?
  8. Patriot Services

    Patriot Services LawnSite Fanatic
    Messages: 14,360

    Have you replaced the fuel line and filter and eliminated the cap causing a vac lock condition? Also make sure you get a filter designed for gravity fed systems. Is the tank gumme up? :usflag:
  9. toac

    toac LawnSite Senior Member
    Messages: 349

    So I may be an idiot.

    I've checked the fuel lines and filter and started the mower without the gas cap on with the same issue. What I didn't check was the gas tank thoroughly....

    As I look at it again tonight in the garage (while it's a bit darker), I use an LED flashlight to look into the tank. Inside I see a shine right back at my eyes. There was a black piece of plastic that may or may not have been the problem. It was right over the where the gas line connects. After removal everything seemed to be running fine, even with the blade engaged.

    I will test more this weekend, but I think the problem may have been fixed by simply removing a piece of plastic out of the gas tank.

    Thanks for everyone's responses. A special thanks to Patriot Services for making me double check gas lines and gas tank.

    I'll post again after I have fully tested the mower.
  10. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029


    I don't guess you did this ?

    That would have shown a fuel flow restriction from the fuel tank (blockage).....

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