I have been having a problem with my banshee when I'm riding it. It will run good for 25-45 minutes until it fouls a plug. It's will start to bog out and shut off. The right side, is the side that keeps fouling. I notices at the tip of the silencer, it is very black on the right side and and not on the left side. So I'm thinking the right side is too rich? Any ideas on the problem?