well guys I put my Bcb drag pipe on and was playing with the air fuel screw.I backed it out to far and fell going down the rode..this is funny, I used one of my ear plugs and stuck it I the hole..bike runs great now!! No more backfire and is super smooth..my question is of I make some kinda plug for it and leave it out will it hurt my bike later down the road?? I rode 40 miles home and it never missed a beat!

The reason the bike no longer backfires....is there is nothing to limit the flow of fuel other then the size of the hole...and your bike is running too rich.  You fuel mileage is going to be low.

You should get a replacement screw, then it if requires you to open up the mixture screw more than 3 turns to get the idle mixture correct, you should bump up the size of the pilot jet.  (It is a fuel screw on this carb....not an air screw).

This is the proper way to adjust your idle fuel screw.  Pay attention to the explanation of how to size the Pilot Jet.  If the best mixture (speed) is obtained less than 1 turn out - you need a smaller pilot jet.  If your best mixture (speed) is obtained at more than 3 turns...you need a larger pilot jet.

https://www.youtube.com/watch?v=zm5mB3R8Ucw