tryed everything need help

Thank god i found you guys. I'm a newbie, and am working on my first ride. built this awesome 74 schwinn spitfire with a 66cc and a " high perfor. carb."
the thing ran great from the box. during break in miles my carb broke at the intake clamp. I was pretty far from away so with some twigs and electical tape i riged the thing on and made it home. Ever since the thing could barely run no matter my ingenuity,or the amount of " j b weld" i use. before i saw all the problems people have, I ordered a new P.O.S. carb. that i cannot get any "performance" at all out of.
I tryed all ajustments and float movements and dont know what to do. it runs but if i give it throddle it bogs down .can't be happy travel'in at 15mph.
hope i did'nt waste the 50 bucks. My wife told me to buy the cheaper one.

moving the clip has little change at all. ive been messing with 2 CNS carbs and they both
do the same thing. between the two of them ive tryed 'bout every combination of things with little improvements. should the carb have a gasket on the top under the throttle and choke cables? both of mine dont. im in the process of sealing everything up good to knock that off my list. it runs with full choke as long as i accelerate slowly. wide open just dies. don't go fast and don't sound the greatest. this bike was the awesome at first and would do 33 mph no problem so i can't see why i can't get it working with the main jet it has. just don't make sense.