Posted by Bob Farrell on July 02, 2008 at 06:49:01 from (64.149.54.194):
In Reply to: 400 gas smoking posted by Paul In WI on July 01, 2008 at 17:19:04:
I would think if it were valve guides the smoke would be bluish in color and there would be at least some engine oil consumption. If the smoke is black, even without a load, I would think it is running way too rich on fuel. You may have incomplete combustion (due to too rich air/fuel ratio) therefore the black smoke and the carbon deposits on the plugs thats fouling them out. Adjust the main fuel screw on the carb and see if that helps. Also any restriction in the air intake will cause a too rich condition. Service the air filtration system - including the piping. Late timing can also cause incomplete combustion. Good luck and let us know what you find. bob f.
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