i have a 92 banshee with a few mods, pipes,jets, port and polish and higher compression. it started cutting out at high rpm and i couldn't figure it out. then i checked air/fuel mixture, one was at 6 half turns out and the other 2. i set them at 3 half turns out and it got a little better but still cuts out any suggestions.

 

The airscrews just adjust the idle air mixture. They have nothing to do with topend. The only thing that adjusts top end is the main jets. It sounds too lean.