Hey guys, My bro bought a brand spanking new yz 450 at the dealership in my country in january, its been giving him issues since june, the bike stalls, coughs, and sometimes shuts down on iddle , ONLY WHEN ITS WARM, or after a few laps on the track, has anybody had this issue before? the idiots at the dealership dont have a clue on whats wrong with it, could it be the fuel filter?, Can someone please shed some light on my problem please? We are desperate, seriously dont know what to do with the bike. Thanks in advance!!!