Hi guys, this matter has still not been resolved. BMW South Africa are defiant and will not acknowledge that there is any issue. I still have this problem and have been contacted by many other riders who also experience this intermittent 'misfire' (or pre-ignition, detonation) on their 1200GS's. This seems to be more specific to the DOHC models and more so here in South Africa (although others have reported similar symptoms). I would like to post this to a German BMW motorcycle club forum and see if anyone there has an 'inside' technical contact in BMW Germany.