I've only had 2 sets of aftermarket carbs. Both sets were Novi 48's. I used o1 set on limted SXR and 760 blaster. Tim at Novi got me the jet specs for sxr and Scottie Mac took care on me with blaster. Both tune by me, famous racer #216 Joe P & a PET tach. Both sets had excellent throttle responce thru the full rpm range.