tuning a gp3 rep carburetor

hey im new to this site and just traded up from a b1 rep to a gp3 rep man what a difference lol but am heving troubles with the carb. It idles fine runs fine but when i open it up it dies instantly im gessing floats if smoesort of block in there??????????????????????

Sounds like you probably have a blocked main jet. I'd pull it out and have a look. Just blow compressed air through it if its blocked. Other than that, not sure. Have you seen the bike running ok before?