So quick info on my bike. It has around 10,000 miles on it and just a two Bros slip on. Everything else is stock. I changed the plugs 2 years ago with Ngks(not iridium) After taking it out of storage I noticed it was hesitating at higher Rpms. I used stabil for the winter storage. I pulled the plugs and noticed the first cylinder plug was in great shape but they progressively got worse until the fourth which was shot. I check the for and no leaks in the vacuum line. I have no idea what it could be. Any help? I switched around the coils with the fouled plug to make sure all the coils were fine they seem to be all working. I run 87. Any suggestions would be greatly Appreciated.