Thanks everyone for the responses. Now to answer some of the questions. It hasn't overheated recently but got pretty hot at about 12500 miles back around June. I changed the oil right after that but didn't notice the leak then. I used regular standard Harley oil. I've got about 13500 miles on it now. No cylinder work. I first noticed the leak about a month ago after a full day of riding at about 13000 miles. No major mods. Screaming eagle pipes and air filter. It's definately not the rocker box gaskets. The leak is lower than that. If it is the head gasket o-rings, can the leak be stopped by tightening down the bolts or should they be replaced?