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I give up on Kohlor Command 25


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#1 Auburn David OFFLINE  

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Posted January 28, 2015 - 02:35 PM

some time back this engine (on a GT5000)backfired on shut down and bent the pushrods and valves on one of the heads..after some time I located the parts and repaired it..well this morning it did the same thing..I had already checked the sheer pin and such,replaced the carb and have it a good clean up and tune up..looks like I will be installing a B&S on this one.

 

This engine probably has less than 300hrs on it from new..I am the only owner of it.



#2 Auburn David OFFLINE  

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Posted January 28, 2015 - 02:36 PM

Darn..I misspelled Kohler..



#3 glgrumpy OFFLINE  

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Posted January 28, 2015 - 03:45 PM

That darn piece of junk!  Want My address, so you can send it here and I'll get rid of it for you??


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#4 boyscout862 ONLINE  

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Posted January 28, 2015 - 04:20 PM

Sounds like cam timing. Good Luck, Rick


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#5 Auburn David OFFLINE  

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Posted January 28, 2015 - 04:21 PM

I just dont get why it keeps doing this,it is a great running engine..lots of power..but it has always had a little backfire on shut down.



#6 Auburn David OFFLINE  

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Posted January 28, 2015 - 04:25 PM

Sounds like cam timing. Good Luck, Rick

Sears came out and looked at it right after I got it and they said it was the fuel shut off valve on the carb..so they replaced the carb for free..that helped for some time till it started again after a few weeks..thats why I replaced the carb with the new head this time..and it still did the same thing.


Edited by Auburn, January 28, 2015 - 04:27 PM.

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#7 Talntedmrgreen OFFLINE  

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Posted January 28, 2015 - 04:33 PM

Is it being shut down by the book?  Almost every one of them will backfire if idled down before kill.


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#8 Auburn David OFFLINE  

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Posted January 28, 2015 - 04:55 PM

Is it being shut down by the book?  Almost every one of them will backfire if idled down before kill.

Yea,little above 1/2 throttle before shut down..Kohler sent me a letter in the mail about how to shut them down(sorta like a service bulletin),I have always followed it to the tee,and I only run ethanol free gas in it like they recommend.

 

seems to be a common problem per Youtube..



#9 Alc ONLINE  

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Posted January 28, 2015 - 04:59 PM

Sorry this happened again to you . I never head of a special way to shut off a engine ,hope someone would share more about it

Ok I'll take that back ,I'll wait a little on our work trucks before shutting off the engine to cool the turbo down

Edited by Alc, January 28, 2015 - 05:01 PM.

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#10 Auburn David OFFLINE  

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Posted January 28, 2015 - 05:05 PM

From what I understand when you turn this engine off it doesn't kill the spark,it just closes the fuel valve?


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#11 propane1 ONLINE  

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Posted January 28, 2015 - 05:06 PM

I always set the speed down then after a minute or so, down a bit more, then on idle, then off. I just like to let them cool of a bit before shut down.  Noel


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#12 propane1 ONLINE  

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Posted January 28, 2015 - 05:10 PM

Maybe thats why it does it, The spark would still be lighting the left over fuel. It would be a lean mixture which may cause the backfire.  Just a thought, Noel


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#13 Auburn David OFFLINE  

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Posted January 28, 2015 - 05:15 PM

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#14 propane1 ONLINE  

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Posted January 28, 2015 - 05:40 PM

That seems odd, but I guess you have to do what the book says,  Noel



#15 WNYTractorTinkerer ONLINE  

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Posted January 28, 2015 - 05:50 PM

The reason you shut the engine down like the manual says is TO PREVENT S/D backfiring!  So if your engine had bent valve components I'll wager the Flywheel key has been stressed or partially sheared and the spark timing would be a bit off and cause the ruckus you are seeing.  Just a thought-  Check it out if you like  


Edited by WNYTractorTinkerer, January 28, 2015 - 05:51 PM.

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