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Questions for Small Engine Mech's....

Discussion in 'The Okie Corral' started by 3rdgen40, Jan 11, 2010.

  1. 3rdgen40

    3rdgen40 .45 fanatic

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    I have a Cub Cadet mower with a Kohler 20hp Twin Cam OHV engine.It has only 90 hours on it,with a DOM of 07/2006.Last time I had it running it was hard to start and was blowing a little blue smoke.This was about 3 months ago.I tried to start it the other day and it cranked slowly sputtered like it was trying to start,then quit.Now, it cranks slowly and pops like its about to start up,then the flywheel jerks backwards(counter clockwise).It blows white smoke out the exhaust while it turns over.It also made a knocking noise a couple times when it almost started.It has fire, its getting gas...but will not start.
    So, any ideas ? Warranty is expired( I think ?). :dunno:
     
  2. harleyfx69

    harleyfx69

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  3. 220-9er

    220-9er

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    You said its been about 3 months. Lets start with the simple stuff first. How old is the gas in the tank?
     
  4. 3rdgen40

    3rdgen40 .45 fanatic

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  5. 8-Ball

    8-Ball Old Soul

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    Have you replaced the spark plug?
     
  6. 3rdgen40

    3rdgen40 .45 fanatic

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    No, but I did check it and it does fire.
     
  7. fgutie35

    fgutie35

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    I will start by removing the carb and give it a good clean thru every orifice. After that, check your electrical components (plugs, coil, etc..).
     
  8. Slacker

    Slacker Millennium Member

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    Have you tried using a little starting fluid? If so, how did that go? Have you checked the compression?
     
  9. 3rdgen40

    3rdgen40 .45 fanatic

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    No starting fluid yet.Compression is 90 psi.
     
  10. 8-Ball

    8-Ball Old Soul

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    Even if it sparks, the plug may still be bad.

    Give it a little squirt of carb cleaner and see how it runs off of that. If it runs good off carb cleaner, clean the carb.
     
  11. inthefrey

    inthefrey Moved on...

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    Blue smoke is never a good sign.
    OHC? Sounds like you may have a valve seal leak. **not good**
    Also, did you run over anything? Sounds like you have a timing problem too. These are just guesses without seeing-hearing it.

    Edit:
    or a blown head gasket
     
    Last edited: Jan 11, 2010
  12. 3rdgen40

    3rdgen40 .45 fanatic

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    Haven't ran over anything...:dunno:
     
  13. Mungrol

    Mungrol Wanabe Like RTN

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    What he said,

    Most times lawnmowers run into problems after long periods of non-use. Usually what happens is the carb gums up. The best way to prevent this in the future (once you clean it out) is to either put "Sta-Bil" in the tank, run the thing for about 5-10 minutes before storing. Another way, but can still cause it to gunk up, due to residual fuel, is to run it out of gas before storing.
     
  14. 3rdgen40

    3rdgen40 .45 fanatic

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    I'll try a new spark plug and some starting fluid next I guess.
     
  15. nels19

    nels19

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    Sounds like the shear pin on the fly wheel is sheared had this happen to me last summer. If the fly wheel has moved a little its out of time and it won't start..
     
  16. slhfarm

    slhfarm Wheeee!!!!!?! CLM

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    Battery good? Try jump starting it.
     
  17. Bigworm74

    Bigworm74

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    i would just clean up the spark plug with some sandpaper and try it out again try using some starter fluid too
     
  18. 3rdgen40

    3rdgen40 .45 fanatic

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    Good idea.I'll check that tomorrow.
     
  19. 3rdgen40

    3rdgen40 .45 fanatic

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    You nailed it ! I just checked it.Sure enough,the half moon shear pin was sheared off,which allowed the flywheel to move just enough to throw it out of time.
    Thanks ! :wavey:
     
  20. Rinspeed

    Rinspeed JAFO

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    Good point, I've seen plugs that sparked fine outside the cylinder but not under compression.