My little one (ZX9R Bj.98) has a massive power hole between 7000 and 9000 rpm.My 9er was a “grey import” i.e. according to my dealer, it is more different.But have now a “German” engine in it but still the “old” carburettors i.e. there were 150 jets in it and my dealer told me that in the German version 155er in it we have also changed.But still does not work.Now we want to change the carburettor needles (the “significantly” They are supposed to be thinner) but cost 18€ per piece !! Do you have an idea?