Hey IL_Vaq, if you have access to a bike jack, get it of the ground and see whats going on. There is nothing wrong with the steering bearing, thats a near new bike! lol, sounds like the shop did not install the wheel rite or left a bearing out or did not do a good balence on the tire. Anyways, get it up off the ground and have a friend firmly hold the handle bars, and you grab the front and rear of the tire and check for a loose fit by moving it back and forth. Next spin it as fast as you can while looking for un-eveness in the distance of the contact part of the tire to the rim. Hopefully at this point you should be able to see the problem. If nothing after this, then i say spend 70 bux and take it to a Kawi dealership and have it checked out. If they cant duplicate the problem they usally will not charge you.