O.K. here I go again with a newbie question...I'm sure this will get me some more smart ass replies...lol. I just raced my first MX this week and while I was on the line I looked down and noticed my '00 426 blowing coolant out the overflow like crazy. I use a 50/50 mix with water wetter (1 oz.) and my radiator cap is the stock 1.1. I always fill the radiator to the neck when it's cold. My friend has a '98 400 and he has no problems with this at all. Just wondering what I'm doing wrong. Would a higher pressure cap help? If so, where can you purchase one? Are there any disadvantages to having a higher pressure cap? Any other suggestions would be appreciated. Thanks!