poping and no power 1/8-1/4 quarter throttle

lude

XS400 Enthusiast
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so my bike will start first kick when its very old, idles great, smooth and clean sounding, however when i go to take off i have a big dead spot in the first bit of my throttle, sometimes it spits and pops and seems to have gotten worse as the weather got colder, i tried messing with the idle screws but no real luck, runs great from 2 turns out to 4 turns out, i left it at 3, any ideas?

its a 78 with 82 sohc carbs with the stock 42.5 and 132.5 have 135s ill try but i dont think this has anything to do with that, didnt touch the needles yet, bike picks up speed after that dead spot and seems to have good power, has stock air filters, and what i think are stock mufflers
 
Clogged pilot jet possibly...If it were me, I would clean the carbs and put a new fuel filter on...
 
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