I 100% agree with AVB - even if it was the crappiest and unsuitable bit of material, it should have lasted more than the few weeks.
A Homelite I was doing last week had fuel lines that looked good on the outside, but gummy/disintegrating internally. The gum would block then clear then block the jets in a cycle.
As AVB said, often after installing the carby kits you need to do the fine tune, but I can't see the change being so great that it won't rev at all.
Try the fuel lines (and the gauze filter again). I have found that screwing the idle screw in a fair bit will get it running on both the primary jet and idle circuit.
And then put the choke on a bit - sometimes this added suction clears the main jet.
The better way is to remove the mixture screws and clean it out properly, but sometimes the quick fix works just as well - as long as it wont suck any more muck in from gummy fuel lines or filter.
I tried everything on that homelite, and in the end it was the bloody Tygon fuel line.
Regards
Tyler