Kohler CV490S Single Cylinder Smoking Blue


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Old 03-21-11, 11:02 AM
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Kohler CV490S Single Cylinder Smoking Blue

It is a 17hp kohler cv490s on a craftsman tractor. It is blowing blue smoke pretty good. I did a quick compression test and got 100 psi which I thought was acceptable. I have not done a leak down test yet but will soon. A funny thing happened as I was doing the compression test. I always remove the spark plug and turn the engine over in case there is gas etc on top of the piston. Well a lot of gas blew out of the spark plug hole. It blew across the garage. This engine does not have a fuel pump. I am thinking needle and seat problem. I also want to check the breather but dont know exactly where it is. Thanks in advace for the help. I appreciate it.
 
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Old 03-21-11, 12:34 PM
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Well, I just did the leak down test and it seemed to pass. There was little if no leakage per the guage.
 
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Old 03-21-11, 12:48 PM
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Could be a needle and seat problem, check/smell the oil if the needle/seat is failing the oil is probably overfull, if so, don't run it until you change the oil. Have a good one. Geo
 
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Old 03-21-11, 12:49 PM
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Make sure the oil level is not over full. If so and it smells of gas, I would say you guessed right on the needle n seat.
The crank breather will be on the other end of the hose going to the air filter housing.
 
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Old 03-22-11, 12:29 PM
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Well, I removed the valve cover and found a gas/oil mix laying on the bottom. The breather mesh is gas/oil soaked. It is encased in a tin box. How do I clean the breather assy -- hot water and soap ??? Does the breather come apart ?? The reed valve appears to be ok -- it doesnt seem broken. Should I add some auto trans fluid or marvel mystery oil to the oil when I change it to clean things out and then change the oil again after running a few minutes - maybe five to ten.
 
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Old 04-03-11, 05:32 AM
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This engine has a brass seat. I replaced the needle and it still leaked. I next purchased the 12-521-03-s seat kit. This kit was announced in late 2009. Replaced the seat and also new needle -- no more leaks and no more smoke. I made sure all of the gas/oil mix was removed from the block. I also cleaned the breather with carb cleaner.
 
 

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