Hey I have a new old yz450, its a 2004. when i got it the fuel screw was not in the carb. I put a new one in and now when i start it it gets hot quick and coolant overflows out of the little clear hose that comes off the cap. I have hand four 250fs and not one got hot that quick. any suggestions? PS I am not letting it idle very long so I don't think it supposed to happen.