never had this problem, which I dont go fast anymore either. sometimes incorrect jetting can cause it to happen. but how long where you running it wide open? If running it for along period of time and with certain weather conditions it will also cause it to get hot.
My buddies 450 Foreman does get red hot,runs great though so he doesn't worry about it.What if that exhaust valve was set a little too tight,hence it would be partially open during combustion causing the hot combustion to exit the headerpipe.
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