they have terrible casting flaws, they are cheap for a reason.
when i had mine, i de burred them and drilled the main fuel port, and still could get it to run right, i took the bike to the dyno, he said "ha hah ha those carbs are junk" but he couldnt do anything (i thought he was just shit anyway) spoke to hjr about them as he did the port work on my bike back then. and he said they are pretty average carbs and people have problems with them.
they are way hit n miss.
you can get pwks for like 330/350 a set and mikunis for cheaper i think..