Had a little problem with my 2009 F800GS (23,000 miles). I was riding along and got two surges, then a brief clunking noise and then it shut off. The shop discovered the timing chain had come off. They were worried about engine damage caused by the chain being loose but there was no apparent damage. However when they got the engine back together (two weeks later, parts from Germany, etc), the engine is now knocking. They think the whole engine will have to be replaced. This means at least another two weeks without my primary transportation. Has anyone else had such a severe problem with a relatively new bike? All the work is under warranty of course but at this point I'm a little pissed with the quality of the BMW and not being able to ride for at least a month. For those that did have problems of this sort, particularly with BMW, what options did you have? Is it worth it to talk to BMW NA?