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Kohler M20 issue

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Posted May 25, 2016 - 11:58 AM

If I could get a few guesses from the experts, it sure would save me fumbling around I am sure.  I have an 800 hour 20 Magnum in and Deutz Allis 1920.  It starts, runs, great.  The previous owner told me it needed to be choked to run.  After about 15 minutes, sure enough, it starts sputtering and needs choking to stay running.  It ran fine until it ran out of gas, then we fueled it up, and the problem started.  It never really got hot.  Can a fuel pump act up like this?  it sure seems like it is starving for fuel.  When it is running good, it sounds and powers great.  It is kind of a slow sputtering die.  Any guesses would sure be appreciated.

#2 Auburn David OFFLINE  

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Posted May 25, 2016 - 12:02 PM

Sounds like a piece of trash in the carb to me..

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#3 Cat385B ONLINE  

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Posted May 25, 2016 - 12:19 PM

How is the fuel line routed? Take a look where it comes into the engine compartment, it may be heating up your line.

Another thing to check, unscrew the fuel cap when it starts to sputter. If it clears up, you have a vented cap that is defective.
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#4 Cat385B ONLINE  

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Posted May 25, 2016 - 12:22 PM

Or, send it up to the Anoka, Mn Fastenal. I will get it purring and send it right back.

Right back = next spring.
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#5 olds45512 OFFLINE  

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Posted May 25, 2016 - 02:37 PM

It could be the vent in the gas cap is plugged or the fuel pump is going bad, I doubt it's the carb because it doesn't do it for the first 15 minutes you run it. Pull the dipstick and check the oil level, when those pumps go bad they tend to leak gas into the crankcase.

Edited by olds45512, May 25, 2016 - 02:39 PM.

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#6 EricFromPa OFFLINE  



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Posted May 25, 2016 - 05:29 PM

Could be just another clogged paper element filter.Ethanol puts a hard yellowish glaze on fine element filters and restricts fuel flow.Ever have to take a weedeater carb apart and clean the fine mesh screen? Same thing all thanks to Ethanol.

#7 Canawler OFFLINE  



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Posted June 01, 2016 - 04:13 PM

Will it start back up if you let it sit for while? My Magnum 18 did that. Ended up being a fuel pump issue. One of the internal press fit check valves would drop out of it's bore when hot, then when it cooled it would stick back into position and work until hot again. I found several other cases of that happening when I looked online. I went to an electric pump and never looked back.

Edited by Canawler, June 01, 2016 - 04:14 PM.

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