So I'm pretty sure I know whats goin on here, but I'm not sure what needs to be replaced. I've noticed the past few times i've ridden, I test the bike the night before and everything works great. I get to the track, bike won't start easy, runs like shit, ect. Each time I pull the plug its fouled. Its fouling in the process of sitting still and not being ridden, something is telling me the carb is leaking gas/oil into the cylinder. I doubt its coming from a leaky petcock because I feel like I would see gas pools under the bike from the overflow tubes. I have a feeling something is worn out in the carb and needs to be replaced, any ideas?