Hey all i got a 2004 yz450f and it starts fine but when i gun it the bike seems to get stuck on high idle for about 5 to 10 seconds. Even after it warms up. Some times the only way to get it back down to idle is to mess with the idle screw. I checked the exhaust for leaks and did find any that i can see. Cleaned the carb and still the bike gets stuck. When im riding the bike its does the same thing but im in gear so that slows the rpm down. Any ideas?