I know this is probably just another dumb question coming from someone who know nothing about engines. Everyone is talking about fouling plugs. What is this, how is it done, and how can you tell. I know that you can pull the plug and take a look at it but can you tell without pulling the plug. Will there be a noticable differance in the way the bike runs or will it not run at all? Can you continue to ride with a fouled plug?