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Smoking Kohler Magnum 20 hp


Ron4675's Avatar
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10-03-14, 12:58 PM   #1  
Smoking Kohler Magnum 20 hp

Hi new to site but need help I have a Kohler Magnum 20 HP MV20-S 57527 engine in my Craftsman lawn tractor problem is when you start the motor it smokes like crazy. I have cleaned and replaced the breather and replaced the head gaskets but it still smokes. The oil is clean and does not smell of gas. Any help would be great thanks

 
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10-03-14, 01:07 PM   #2  
What color is the smoke, white/blue=oil, black=fuel. Have a good one. Geo

 
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10-03-14, 01:48 PM   #3  
Smoke is oil white/blue it blows it thru the exhaust on the ground and smells like oil.

 
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10-03-14, 03:35 PM   #4  
Hello Ron4675,


Can you please elaborate on this;

I have cleaned and replaced the breather

Do you have a part number for this breather you replaced ?

Also, After starting this engine, Does the smoke eventually clear up and stop ?

 
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10-04-14, 04:58 AM   #5  
Name:  breather assy.jpg
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Size:  14.3 KBThis is the breather assy I replaced and cleaned all the built up stuff around the motor before removing anything and I have not let it run that long maybe 45 seconds to a minute for fear I may blow something up...lol

 
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10-04-14, 06:54 AM   #6  
Hello Ron4675,


You could have solved the issue with what you replaced, But..... If oil was coming out of the muffler there's likely still oil in it. As long as the engine isn't knock'n-rock'n or rattle'n, You should run it up to normal temp to burn the oil out of the muffler and see if the smoking subsides.


Good Luck

 
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10-06-14, 03:54 PM   #7  
Kohler Magnum 20 HP MV20-S 57527

Ok guys thanks for all the support finally got it to stop smoking.....now on to the next issue......are you ready I start the engine and it seems to run fine except the RPM's drop and then The governor kicks in and brings it back but it keeps going like that for as long as I leave it running I haven't driven it yet but sitting in the garage in neutral it drives me nuts any ideas would be great remember a Kohler MV20-S 57527 Thanks Guys

 
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10-06-14, 04:07 PM   #8  
It can be caused by a lean fuel/air mixture. It's pretty common - called hunting. Somewhere the gas flow is hung up. Could be in the feed to the carburetor or in the carb.

If the fuel is cleaned up there are governor issues that cause that type of surging.

 
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10-06-14, 04:15 PM   #9  
You could have an air leak, while it is running spray/dribble carb/brake parts cleaner behind the carb and along the intake mating surfaces, if the engine tempo changes you have a leak and can take the appropriate action. Have a good one. Geo

 
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10-10-14, 11:06 AM   #10  
Ok finally tractor is all fixed runs like new ended up cleaning the carburetor didn't replace anything just gave it a good cleaning in a ultrasonic cleaner with some good parts cleaner so no more questions for now thanks for all the help !!

 
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