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  #1  
Old 05-07-2002, 10:22 PM
PABresnick PABresnick is offline
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Join Date: May 2002
Location: Vermont
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Kohler 26 Hp backfire on decell

I have a Kohler Comand 26 Hp with less than 100 hours that started out by dieseling at shut off and has now progressed to stumbling on accelleration and also back firing with a large flame out the exhaust when you reduce the throttle. Head gaskets were done last year to eliminate the oil consumption problem and the carb has been cleaned but I found no dirt or varnish. Kohler is sending me a new accellerator pump diaphragm but the old one was fine. The fly wheel key is also good. Carb is not adjustable on mixture but float level is good. This is a model cv25s on a Craftsman tractor that is 3 years old. I bought it used so I have no warranty and parts can get expensive if I start guessing. Any help or ideas would be great. I figure its getting extra fuel on decell to shoot the flame.
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  #2  
Old 05-08-2002, 12:52 AM
khouse khouse is offline
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Location: lee's summit, mo
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You can get a backfire if there is a hole in the muffler or the muffler gaskets are bad.
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  #3  
Old 05-08-2002, 06:39 AM
PABresnick PABresnick is offline
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Exhaust is good and there are no leaks.
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  #4  
Old 05-08-2002, 09:34 AM
khouse khouse is offline
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Maybe it's running hot? Have you dechaffed the engine? On my 25 command the carb was cleaned twice with no effect. Kohler sent a brand new one to put on and it runs great now.
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  #5  
Old 05-11-2002, 07:08 PM
selph selph is offline
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Location: Bunker Hill, Illinois
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I have the Kohler Command 25 HP on my Grasshopper. It also does this. Now it will run fine until it gets warm (20-30 min.) and the starts backfiring really bad. It does it worse under full throttle. Any ideas? The problem may be the same as yours Dave
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  #6  
Old 05-12-2002, 01:42 PM
khouse khouse is offline
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Does either one of your engines have a lot of tappet noise? It will be a light to heavy clicking or ticking noise from the lifters not pumping up.
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  #7  
Old 05-12-2002, 02:08 PM
selph selph is offline
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No tappet noise at all on mine. dave
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  #8  
Old 05-12-2002, 09:51 PM
danzig danzig is offline
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Location: shawnee,kansas
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Sounds like a faulty coil. The backfire could happen if the exaust is too rich from all the fuel not being burned up. Mine does this but i know it has a hole in the muffler.
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