Hi been working on my bike and i am almost near to get her to work on top condition. My last and only problem is i've got part throttle hesitation under 5k rpm and no problems up beyond that and when you let off the throttle from high rpm it misfires. The bike is stock and got new spark plugs. I am feeling the bike is rich , not yet confirmed but the last spark plugs i took out is color black, no black smoke out of the muffler. No mil lights whatsoever. Hope somebody can help me thanks..