Suzuki have just replaced the bearing, the bush as well as the shaft to try to rectify the noise. ( squeal after 20 -50 hrs ).
Unfortunately it wont be for another 50 or so hours until I know if the problem has been resolved.
Very frustrating as the engine is fine in every other aspect.
Perhaps a bit unlucky as I know others with the same engine who have no issues. Although they do not do the hours I do in the same time frame.

We will wait and see.