Okay I have a yz450f 2004 and I ran a stock exhaust and stock header pipe with 91 octane gasoline from the pump. I recently bought a pro circuit T4 slip on an kept the stock header and put VP110 race fuel in it. It was waay too lean so i put a bigger jet in it. The bike ran way too hot. Even on the stand it wud puke anti freeze out of the overflow of the radiator and smoke. The plug was still white so I put a bigger jet in it and a new spark plug and now it won't start. I got it to fire once but it wud not idle and it wud POP like crazy then it died. It was only running for literally probly 30-40 seconds and the radiators were already super hot. Plz help I really need to get this figured out before my race on Saturday. Thanks in advance.