My best guess would be the plugs aren't igniting the fuel and it's collecting on the plug.
yes
Due to improper fuel-air mixtures.
One spark plug could foul up and quit on you but I don't see all of them quiting at once.
Gas mixed to rich
spark plugs tend to foul because too much oil builds up around the plug and it cannot work correctly. *sometimes* you can actually remove the plug, clean it, re-gap it, and replace it in the bike.
Spark plugs don't really burn out, they foul out. A spark plug is used to ignite the fuel/air mixture squirted into the cylinder by the fuel injector. The plug sends a spark and boom small explosion. However gasoline is not 100% clean, so it leaves carbon deposits on the plug. Over time these deposits foul the plug.
Yes, a clogged catalytic converter can lead to fouled spark plugs. When the converter is obstructed, it can cause increased exhaust backpressure, leading to incomplete combustion and unburned fuel entering the exhaust system. This excess fuel can then accumulate on the spark plugs, resulting in fouling, which can affect engine performance and efficiency.
Yes, too much oil can foul spark plugs. When excess oil enters the combustion chamber, it can lead to incomplete combustion, causing carbon buildup on the spark plugs. This buildup can prevent the spark plugs from firing properly, leading to misfires, reduced engine performance, and increased emissions. Regular maintenance and monitoring oil levels can help prevent this issue.
You might have a blown headgasket on top
If the injectors are spraying more fuel with out anything else changing, then yes, the plugs will foul. To get more power you need more air in the engine as much as you need more fuel.
Yes it can. If the sensor sends a false reading it can cause the pcm to over fuel the engine.
Yes, if it leaks oil through and on to the spark plugs, it will foul them and cause a missfire.