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Kohler Engine Problem


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#1 Buck OFFLINE  

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Posted June 10, 2012 - 07:49 PM

Hi guys. My Kohler 14 hp K-series has developed this problem that is driving me nuts. I mow about 30-45 mins and it wants to die. I can choke it to "save" it but it happens to often after that to keep mowing. It seems to happen on a slight up hill leaning to the right as your sitting on the seat. But it will only do it after 30-45 mins.
This is what I have done. Took off and cleaned the gas tank, took the carb bowl off and cleaned, added fresh fuel, changed fuel filter, cleaned air filter, took the coil off my 16 hp Kohler and switched them, switched sparkplug wire, took the air comp and blew out built up grass and crap from engine. Running 87 octane fuel and Castrol HD 30 weight oil.
I can let it cool down after mowing for some time and go back out but its like clock work. 30 mins later and its sputtering, loss of power and I can give it short burst of choke to get back to the shop. I also tried to keep a full tank of fuel but it still happens no matter how much fuel is in the tank. Any Ideas?

#2 chris m OFFLINE  

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Posted June 10, 2012 - 08:01 PM

have you made sure the fuel cap is venting? I have seen this problem come up lately.

Also what type of spark plug and how old ?

If these are ok, the only other thing would be to take carb off and rebuild it.

Good luck :thumbs:
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#3 Buck OFFLINE  

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Posted June 10, 2012 - 08:10 PM

The plug is I don't know how old and thats the one thing I have not done. I do think the tank is venting unless it does not after 30 mins.

#4 olcowhand OFFLINE  

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Posted June 10, 2012 - 09:00 PM

My MF14 I used to have would act the same way, and ended up being a bad fuel pump. I've seen posts from others here end up being the same.
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#5 chris m OFFLINE  

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Posted June 10, 2012 - 09:04 PM

Reason both can cause a problem is this. A bad plug (Like Champions usually are) can be worse when it gets hot. The cap not venting will cause an air lock in the tank as you run, it takes a little time for it to happen (say 30 minutes or so). next time it happens take the cap off and see if it clears up.

I would change the plug anyway, They may seem ok, but they do break down inside the insulator.

Good luck
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#6 chris m OFFLINE  

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Posted June 10, 2012 - 09:06 PM

My MF14 I used to have would act the same way, and ended up being a bad fuel pump. I've seen posts from others here end up being the same.

I forgot these have a pump. :(

#7 olcowhand OFFLINE  

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Posted June 10, 2012 - 09:09 PM

I forgot these have a pump. :(


Doesn't mean the pump is the problem though. Just wanted to throw it out there.

#8 Buck OFFLINE  

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Posted June 10, 2012 - 09:28 PM

Anyway to check the pump? Tractor runs as it should up to 30 mins.

#9 skyrydr2 ONLINE  

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Posted June 11, 2012 - 03:15 AM

Does it pop when you shut it off too ? Mine was doing the same thing, I fattened up the needle and it never happened again?
And if its a closed sided unit, try it with the sides off, could be vaporlocking.
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#10 MH81 ONLINE  

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Posted June 11, 2012 - 04:29 AM

The whole time I was reading this, I was thinking fuel cap vent. Hope it's that simple, sounds like you've tried most of the other stuff beyond what was mentioned above.
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#11 JDBrian OFFLINE  

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Posted June 11, 2012 - 04:54 AM

You should also check your points for gap and condition. Marginal points can cause spark problems which can cause strange symptoms as well.
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#12 KennyP ONLINE  

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Posted June 11, 2012 - 05:09 AM

(a slight up hill leaning to the right as your sitting on the seat) Sounds fuel related. That has the carb & fuel pump on the high side. Is the float level in the carb set okay? If it has a fuel pump, it may be getting weak.
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#13 Alc ONLINE  

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Posted June 11, 2012 - 05:50 AM

After reading what you have done so far and so many thinking fuel makes me think that if I run into a problem like your I would replace the fuel lines with clear ones ( mine are just black rubber ) to see if there was fuel in them when the problem happens , Al
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#14 Buck OFFLINE  

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Posted June 12, 2012 - 08:44 PM

Thanks for the ideas! I have not had time to play around with it but this weekend I am going to try new plug, change the filter again since i cleaned the tank out, I put a few drops of dry gas in it to help with water but it did it before and after. Going to rob one of the other fuel pumps to see if thats it. I will also take one of my other fuel caps to make sure it is venting. Probably add new fuel lines anyway to clear so I can see if it is gas. But after this next go around I will be stumped. Its such an annoying problem!

#15 wvbuzzmaster OFFLINE  

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Posted June 12, 2012 - 08:52 PM

Sounds like an interesting symptom as the Case 444 is acting similar, except for it is actually running hot, thinking too hot. Dont just about everything to it, cept fuel pump and or swap gas cap. Cept it is got blowby issue for some odd reason... i dont get it. good luck with your Kohler.




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