How do vacuum leaks contribute to an improper air-fuel mixture and fouling?

Sep 1, 2020 ... ... caused the engine to run really rich, which ultimately caused the carbon-fouled spark plugs. Does this sound at all plausible? I don't know ... Apr 28, 2011 ... In theory it is possible for it to be your plugs, although if you have bad plugs, usually it won't even start at all. That is just been my ... Oct 26, 2021 ... If you have a bad engine it can cause those issues yes , burning oil can foul plugs and damage converters also. Carbon fouling is an indication of a rich air-fuel mixture, weak ignition, or improper heat range (too cold). Carbon deposits are conductive and can create a ... Apr 27, 2008 ... If this is indeed my problem (weak ignition) . does anyone have any recommendations for fix/replace? Jul 14, 2013 ... I expect that it is relatively new as the motor produces 105psi compression cold. Plug is a NKG CPR8E gapped to 0.9mm. The air filter is clean. Aug 18, 2001 ... Rich mixture and or rich main jets can cause the carbon/plug problem but if its really bad enough to cause a problem you should see black smoke. Jun 10, 2012 ... The bike keeps fouling the spark plugs (NGK B6HS). After 2 days of riding (+/-100 miles) they both become carbon fouled, the bike started farting and ... 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. Sep 4, 2011 ... I say this as the plugs on the wife's R80 also look a little carbon fouled. ... plug causing the fouling. A leak down test would help ...