In my case it always does....Dessert racing here in NM my bike was overheating -more times than not..... 50+ miles per race- so cooler does mean faster than overheating!!!!!
I have a 05 black 450r that i would like to trade for a banshee+ cash/or even trade for the right banshee-a-arms shocks axel ect... let me know what you have
pics up by tomorrow
if i understand you right your running witn lid on with a bigger tube? If this is the case insted of jetting try running it wih some 1 inch holes in your box you have a pm