Terry,
Did the bike run good Before you tore into the carb?
IF so, it sounds like you did something to the float level (too low).
The bike has a Choke marked Knob, but it is an Enricher not a choke, just so you understand. It doesn't choke off air but adds gas to the mix...
So some how you are really lean and the noise Might be just that.
Properly low jetted,,, the idle screw will be out 1.5 turns...
Don't seat it in Hard, That will ruin it...
The idle jet is not your problem as you say the enricher has to be out 1/2 way.. That is a real shortage of fuel and Not getting to the engine.
Give some more informtion : did it run good before and blabla bla a little more about the problem and When it happened...
The carb is really simple and Might just be a too low a setting on the float level or Dirty jets... Not leaving out a bad air leak into the motor around the carb intake gasket or the intake manifold gaskets.
The Popping noise is probably the enricher out and Lack of fuel thru the carb or too much...
signed....BUBBIE