My bike feels really good and strong, but when I am ripping around the block I notice that it pops a lot when decelerating. It is coming from the exhaust end I know that much. I didn't think it was a big deal but someone mentioned that it could be a lean condition. I also noticed that the pipe will get glowing red hot if I let the bike idle on the stand to warm up. All this leads me to believe the bike may be a bit lean. The plug looked good when I checked it, but I would rather be safe. The bike is stock with a WB E-series slip on. Would the fuel screw take care of this or should I throw in a bigger main?