After playing around with different jets and airjets for a while which all helped a bit but did not cure the hanging idle completely I checked the TPS. All measurements were as specified in the book so I thought I will try it unplugged. Wow - now the idle could be set anywhere between 1000 and 2000 revs - the bike responds better than ever and best of it all it comes down to the set idle the moment I shut the twistgrip! After all that jetting I was quite sure that it had something to do with the ignition been lazy to retard. I went back to the std jetting for this bike and everything works as it should. Tried the bike on the local track and its better than ever. Why does my TPS slow the ignition? Is my CDI not able to incorporate the info from the TPS fast enough to retard the firing point at the right time? I realy wonder about this as the bike is so much smoother and better without the TPS connected.