Um, wow. I have a full yoshimura system, dynojet kit, and it ran fine before.....Till I blew up the motor and had it rebuilt. SO now I got the new motor in the bike, and it's broken in. The problem is around 9K is it feels like it hits a brick wall, power surge, and hesitates to redline, but it only does that 90% of the time. And when cruising it sounds like a tug boat. Check the plugs, changed them, they were black, and it still runns the same, actually, it ran worse after I changed it.