So I'm working all the bugs out and it seems I am running good. Until I hit 20-22 mph, then the engines sounds different and pulls like crap. Noise changes from a whahhhhhhh to a Brrrrrrrrrrrr. Then I can feel the motor pull, let go, pull, then let go. I probably have around 50-60 miles on it. i would know exactly but my digital bike speedo keeps resetting itself, grrrrrrrrr.lol.