Idk bro it fires and I just ran it. It’s a little lean but runs great. I took out the lip going into the carb to the intake and made it flush with the opening. I did the same to the other side. It works good
That's called boring out the carb,and the slide can not be smaller dia than the bore or it will all ways be lean because air is passing by uncontrolled/metered.The carb I bored out to 18mm was a 16mm CNS carb not an NT.