Hi...I currently own a 85 Honda NH 650 that wobbles on the highway at differnt speeds. feels like a flat tire, or when you drive on hot tar injected into a crack in the pavement. Goes away for a while then will come back. Tried adjusting tire pressure, front fork pressure, bushings, the only thing it could be is the front bearings in the steering. Does anyone know what the specs are or how to check to see ithe bearings are bad without taking it apart.