After previously owning a GT that had their standard hands-off wobble, I was really pleased to find that my GTS was absolutely rock solid.
After 3,200 miles, I finally replaced the Sava's with Michelin Boppers about a week ago. (The difference in handling and road noise is amazing!) Then it happened....
I was running about 50 when a light up ahead turned red. As I coasted toward the intersection I let go of the bars just kind of shaking some of the stiffness out of my hands. As the speed dropped to about 40, without any buildup or warning, it went freaking nuts. It felt like the instrument cluster was moving about a foot side-to-side at a high rate of speed.
Had I not immediately grabbed the bars, I have no doubt I would have eaten it in about half a second. I've been riding a long time and this seriously scared the sh*t out of me.
So...my first thought was an issue with tire balance. My dealer doesn't really have the equipment to do a precise balance, but what we did do was take a front wheel off of a new GT that was in the shop and tried it.
I took it up to about 50, let off the throttle and *just* took my hands off the bars. It waited until about 35 this time, but then went into a really violent oscillation again. (The wheel was off of a GT and was running a Pirelli, BTW).
It's strange that I never experienced this with the original tire, but now have experienced with two separate tire/wheel combinations.
I took it in today, and we verified tire pressures, evenly torqued lug bolts, checked play in the hub bearings, tightened up the headset, topcase on/off, tried both the original and the heavier handlebar end-weights, confirmed shock preload settings; nothing seemd to make a difference other than that the speed would vary a bit at which the wobble would begin.
Our next step is to replace the shock and rotor (we won't have the parts until next week). If it's not balance & it's not headset then it seems to indicate possible wear somewhere in the suspension linkage.
It was jokingly suggested that I just don't let go of the handlebars, which is not a bad idea until something happens and you have to let go (like a piece of newspaper blowing into your face, for example).
I've now seen several posts regarding similar problems, and it seems like different folks have tried different solutions with mixed results.
Right after the GTS was released there were several queries about the speed wobbles and seemed like most of the new bikes were okay. Now, it seems like we're hearing more and more about this. I don't know if it's because there are more GTS's on the road, or if they are just reaching an age where part wear is causing this to show up.
Any of you guys with a lot of wrench time have any ideas??
Frustrated in Texas...