yes its like that one. i replaced it recently with one that kiffsta sent.. i don't think its blocked. i think its user error, rather than switching over while still riding i kept going til there was nothing left, stopped and switched.
Yea u would have drained the carbys dry making it hard to start again. Depending on your riding confidence it might be worth having a practice switching the fuel tap on the move in a quiet street. I know i always think the bike is playing up when it stumbles untill the mind finally realizes its just reserve time!