its not really a larger radiator cap. It's just a stiffer spring. The rate is listed on the cap. Usually the stock rate is 1.1. You can get a 1.8 from a ktm or a KX80. This will not allow the coolant
to boil over as easily. The idea that it runs cooler is somewhat true. If you keep the coolant in the radiator it can keep engin temperature cooler. Radiators can't cool when the coolant is on the ground. Switching to a performance coolant can help boiling over. I use Engin Ice. The modifications that YZMAN400 performed can also help. The vented number plate is mostly to bring more air into the intake and cool the ignition but it looks cool and it cant hurt. Stripping the paint off the radiators will help it release heat better. The paint just acts like a wall holding the heat back. Check your jetting also. If its too lean it can cause the motor to overheat. Sand riding and tight trails can put a lot of load on a motor. Good oils will cut down on friction and friction translates to heat. Factory teams have extra louvers over the radiators to help bring more air through them. They also weld extensions or use larger radiators. More coolant and or surface area can help cooling greatly. I think i covered just about everything. Did i miss anything?
[ April 10, 2002: Message edited by: moto madman ]