Our 2004 did it, and our 2008 does it. If you decelerate through 45 - 50 mph with hands completely off bars and your weight leaned back, you can get the bars to wobble a bit. Tried everything to fix it on the 2004, including a number of warranty repairs. End result is, many of these bikes just do that. (Kawi will tell you the same thing if you call them) Check tire pressure, steering head bearings, and rear-wheel alignment, but if all of those are OK and there are no other symptoms, don't worry about it. And don't keep both hands off the bars for long.
