I just bought a 2006 Atlantis with 3700km on it. I am very happy with the performance but get a high frequency vibration when accelerating and decelerating in the 30-45 km/hr speed range. You can feel it through the handlebars and it causes the mirrors to vibrate and the front plasic panels to ´buzz´. The wheels were just balanced so are not a factor. Has anyone had a similar problem and found a cure?