Steering head bearings? Have you replaced the originals with the ALL BALLS bearings? I know that I have a shake in the front end between 45-35 on deceleration. If this is when you have it then you now know where to start. I have the stuff to do mine but waiting for a session where someone has experience and the proper tool to remove the races from the old bearings.
mine does it when I decelerate from 70+ I let off the bars this evening a few times while goin 35 45 and 50 and it didnt wobble at all. I havent tried it lately over 70. I increased the tire pressure this weekend, I had been runnin too low of a pressure I dont know if that has anything to do with it, I ll find out tomorrow. Either way Im probabaly buyng those bearings.