Just had the 26000km service done (at 29500km - oops) and Paul at TSS has fixed the one thing that has bugged me since new; the flat spot from 5500 to 7000. The buzziness in that rpm range has gone too.
Exhaust valves at the tight end of the limit. I would suggest it has been like that since new, as pzkpfw's Zed is (was - woohoo) waaaay smoother than mine.
Never in the history of Jim have I been so happy to have my wallet lightened. And the guys in that workshop smile. Very odd. Anyone would think it was a good place to work.
Bookmarks