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Original post by: Mike ,

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I have been dealing with the same issue on my 2003 White Outdoor (MTD) lawn tractor.  After replacing the head gasket and carburetor with no results, I took it to a repair shop.  They told me the fuel pump had malfunctioned and was dumping gas through the vacuum line into the crank case which was causing the extreme smoke.  They also told me it needed a coil which was contributing to the ignition problem (my tractor would smoke, run for 30 seconds and not start again).  Since they have replaced the fuel pump and coil it is running great and smoke free.  I hope this helps!

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