well i have put the 300 mains in and im running the air screw 1 3/4 turns out very strong very fast. and i cut off the back of the air box to make my coolant bottle hanger...i rode it for 2 hours straight doing hill climbs and some slow tech stuff then i drag raced my friends 450 (and won but when i stoped i was over heating a bit granted it was a hot night i let i cool off and it still runs great but what can i do to make it run cooler? do they make fans for these beast? thanks for all the feed back on the jetting and stuff...any suggesttions to go faster for low $$?