I own 2 2013 tmx supremos and have the same problem with both. it´s a choke/carb problem that´s not been fixed after having had several mechanics attempt repairs. i´ve spent too much money trying to fix it. neither bike is reliable and very difficult to start. it may be the choke spring or something related. i´m not a mechanic. i hate having 2 bikes that i can´t rely on. does anyone know what this problem might be? has anyone had the same type problem?