MZ/MuZ Riders

Hi, does anyone have an original ETZ 250 carb (BVF30N2-5) they wouldn't mind selling me. The bike i have came with a copy and it seems to be absolute garbage, I think it's a Chinese copy of the original carb and I just can't get the bike running right and i'm pulling my hair out. I don't want to buy a new carb because I don't want to end up with another one of the type I've got.

bren[dot]ruddy[@]yahoo[dot]co[dot]uk

Cheers,
Brendan.