Kohler 26 running rough

Discussion in 'Mechanic and Repair' started by r6wild, Dec 13, 2005.

  1. r6wild

    r6wild LawnSite Member
    Posts: 12

    I was getting ready to store for the winter decided to do some maintenance first. Changed fuel filter, oil, cleaned carb, new air filter and plugs. The motor sat for a week when I cranked it up I noticed,it sounds like its missing at half throtle or better but it idles fine. It also hesitates when I throtle it up and somtimes with a slight backfire. Both plugs are gapped at .030 and firing. Any ideas would be appreciated.
     
  2. lawnmaniac883

    lawnmaniac883 LawnSite Silver Member
    Posts: 2,613

    Plugs are both sufficiently torqued down? Did you remove/dissassemble the carb? If so, I hope you blew out all passages after spraying with carb cleaner? Not sure if the mixture settings can be adjusted but if so, sounds like it is running a little rich.
     
  3. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,023

    A hesitation and backfire is a possible sign of a lean condition on the high speed circuit in the carb. To check apply a little choke and try throttling up, If it runs up Ok then the carb. needs to be taken apart and cleaned. If you did in fact do this already it needs to be done again and concentrate on the main jet and high speed circuit.
     
  4. Jman

    Jman LawnSite Member
    Posts: 217

    A 26 horse is fuel injected, what is the model and spec number of this engine?
     
  5. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,023

    Boy do I feel like a idiot, Didn't catch the 26 up top ;)
    Wonder how the carb. was cleaned if there isn't one :confused:
    Your right It's always nice to have numbers.
     
  6. r6wild

    r6wild LawnSite Member
    Posts: 12

    The carb was not taken off when I cleaned it. I just sprayed cleaner into the carb while it was running. Both plugs are as tight as a Texas hat band and it is a Kohler CV26S-69526. I tried to pull the choke out at many different settings.If it was out one quarter it would accelerate ok but once the RPMs leveled out it would start to load up and throw alot of black smoke. So pulling the choke out didn't solve the problem. Also the carbs mixture is non adjustable.
     
  7. r6wild

    r6wild LawnSite Member
    Posts: 12

    Sorry for not mentioning the engine is not fuel injected. It must have been one of the early model 26hp before the EFIs. Its about 5 or 6 years old with 490 hrs.
     
  8. Jman

    Jman LawnSite Member
    Posts: 217

    The 69526 spec was built for Sears. Sears used to use a different horsepower rating than the ASE standard that was used at the time. With their rating standard it was 26 horsepower, by Kohler's standards used it was 25. THat's why I hate horsepower ratings, not as good as torque. Anyway. Take the carb off and have it overhauled, or cleaned out with a new kit installed in it.
     
  9. r6wild

    r6wild LawnSite Member
    Posts: 12

    Update, rebuilt carb still ran rough. Took it to a kohler service center, mech. said it looks like its running rich he took the carb off and inspected and cleaned it. Still ran rough at half to full throtle. He suggested a new carb being the mixture is non adjustable so I broke down and spent the $200 on a new carb and as you would guess still has the same problem. Personally listening to it it sounds like an electrical miss could it be the timing or something any help would be greatly appreciated.
     
  10. Redneckn

    Redneckn LawnSite Senior Member
    Posts: 294

    Air leak would be my guess after everything you've had done. Could possibly even be a head gasket blown. (internally)

    I can guess on the internet all day. Being there is different. But I still think that some form of an air leak is to blame. And from my dealings with the Sears/Kohlers I would think a head gasket is quite possible.
     

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