hesitation

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...

Hey guys, today I took my bike out to go to work and it started right up but it cut off by itself which isn't normal bike had been running perfect. So I get it starting again and take off up the road, but every time I hit about 4k rpms the bike would studder and hesitate like it wasn't getting...