Due to the extra weight of the windscreen-spoiler and possibly also due to the less then smooth roads that I had traveled for 15.000 miles in Asia, the windscreen started to break.  In Bangkok (Thailand) I fitted a 'windscreen support bracket' made by Yut (Dynamic motors) to eliminate further movement (and damage). It worked so well that an other 15.000 miles later the entire windscreen/instrument/headlight-support broke. But after that weak-point was re-enforced with half a kilo of steel, no further problems arose.