Some particular tires are more prone to that than others, and will wobble if you try to ride hands-off. Generally, taking your hands off the bar is not a good idea. The Pirelli Sport Demon front tire I had on my Guzzi would wobble once it got about half worn out, coasting down from about 40, if I took my hands off the bar. It never did it unless I did that though. The Bridgestone BT45s I have on it now don't wobble under any circumstances.
If you have the head bearings adjusted for zero play, and your swing arm bushings are also play-free, and your wheel bearings are in good shape, you may be experiencing an anomaly of the tire(s).
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