Probably won't get a lot of feedback here on your EXC bike as this is a forum for the KTM ATVs. I can't give you much feedback on that particular bike, but it seemed that generally for 4 stroke dirt bikes around that era you about have to pull the subframes to get the carbs out. Buddies with Hondas had to do that and so did I with my 2008 450SXF.