I have a 06 yz450f that has been sitting in a garage for a couple of years. The bike ran great when it was parked and now it gets very very hot very very fast and it also pops and backfires like crazy. I have went through and thoroughly cleaned the carb even went with a larger pilot jet with the same results. I also completly drained the fuel tank and put fresh fuel in it when I cleaned the carb and also replaced the spark plug. Have also checked and the valves are in spec and the timing is correct. I have also tried a new stator and it acts the same. Any help would be greatly appreciated.