I have a 74 and in any gear when I get above 3000-3500rpm the motor sputters and hesitates. Continues to try to pull up through rpm but just sputters. It worked perfectly for months until a few days ago so its not a jet sizing or needle problem. 1. I recently wired a new brake light and plugged in a LED flasher unit. I couldn't get the turn signals to work so I just left it the way it is. 2. Carbs, tank, fuel filters are all super clean. Tank is lined. Running premium only. 3. Pulled plugs and noticed they were pretty sooty. Running rich. Cleaned and reinstalled. 4. Bike has new condensors Can still get up to highway speed. Just sputters over 3000-3500.