Bike wanders ...

[Ridefree]

So I'll try to explain this as best I can . I recently bought a Vaquero and would like to know if any of you have experienced the same thing . When I'm out riding slow speeds , no wind it handles like a dream . When I'm going 60+mph the bike seems to want to kick out from underneath me ( especially when it's windy ) . I can feel it in the rear tire , seems to want to kick out to the right .

I checked the belt and it's over to the left ( see pic ) . I'm wondering if I should take it in and have them check it for alignment . Probably something I can do myself . I checked it for tightness also and I can twist the belt a little better than a 1/4 of the way .

Thanks in advance !!!