www.evanscooling.com get the NPG+ product If you have a whole lot of money to spend, try all the different water wetters, hi pressure rad caps etc.first. When none of those work, then install the NPG. Follow directions carefully !!-- It's very important that absolutely no water remains in your cooling system when adding the NPG.
I had the same problem with my 2003 220 riding tight NJ enduros, kept boiling over big time. I switched to Cycle logic Engine Ice, http://www.engineice.cc/. No boil over at all now.
I was having the same problems, and read on this site somewhere to place duct tape (or something else to block the gap) between the side of the radiator and the frame, and also on the other side between the radiator and shroud. This forces the air through the the radiator. I haven't had a problem since.
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