How do worn piston rings allow oil to enter the combustion chamber and foul spark plugs?

May 31, 2018 ... If the spark plugs have a matte black or grey appearance, it could be carbon fouling — something typically caused by a fuel mixture that is too ... It has a Crane HI-6 ignition and MSD Dist." Well, if it's fouling plugs, (assuming the fouling is from gasoline and not oil, such as caused by bad rings or ... Dec 29, 2005 ... These assume that you're getting carbon or fuel fouling on the plug (which are dry, sooty deposits - if wet, they smell of fuel.) Oil fouling ... Jun 5, 2024 ... Since all four plugs are fouled, I would lean towards oil. You may have lost a seal on the turbo, or the new PCV diaphragm may be faulty. Feb 17, 2016 ... May not be a fuel problem. Weak spark will cause the same thing, carbon fouling. First question, dry foul or wet? Wet is oily, and could ... Sep 25, 2006 ... The Boating Forum - What causes a fouled spark plug?? - I have a 2003 Yamaha 130hp. One of the plugs has a wet tip with carbon build up. Jan 29, 2022 ... While they do have a lot of carbon on them; I doubt ... You need to determine whether its spark or fuel that is causing it not to start. Jun 6, 2011 ... Usually fouling is caused by too rich a mixture or weak spark, afaik. I think getting the right adjustments on the carbs, ensuring the proper amount of spark. Jul 3, 2003 ... I have a recuring problem with #1 plug (front of engine) fouling with carbon from what one would describe as an over rich fuel mix. Feb 28, 2014 ... Years ago I thought a plug fouled was because of the carbon and lead build up. ... cause of sparkplug fouling is oil getting into combustion ...