I have an '06 1200GS (40, 000 miles) which *seems* to be exhibiting some headshake. I'm not quite sure what's causing it, though. The headshake is present when accelerating, particularly uphill, and when passing cars and/or changing lanes quickly, all while under hard acceleration. The headshake isn't violent (once it was, just accelerating hard up to about 90mph) but it's very disturbing. The Ohlins front and rear were just rebuilt last winter, but the issue was present prior to that I've had a somewhat "down" season without as much riding as normal). Yesterday I visited a very well known and knowledgeable Japanese bike tuner here. He has worked on BMWs a lot, including GS's. His immediate remark was how light my steering head bearing felt. Though no play or notchiness is felt, it just feels sooooo light. His suggestion was to enjoy the rest of the season (I can mitigate the shake with a stabilizer and the preload in the rear cranked a bit) and to bring it to him once the nice weather is finished. I suppose that the super light feel in the bearing is a bad thing...how do I "test" it or get an idea of it's out of spec, or if it just needs to be tightened, or what? Can you guys give me some advise? Thanks!