Just like the original which was probably made in the same place as the ebay chinacarb!95% chance it is the carb. If you can get it running play with the adjustment screw just a little bit and see if that clears it up. New carbs on Ebay are super cheap and it should be a 20 minute swap. Just don't expect long life out of the chinacarb, 3 years and you will probably need a new one.
Checking the screen is easy, do that as well. Pull the plug and make sure the gap looks ok.