Rear Main Bearing Clearance

[Graham Barker]

Chris, thanks for giving it some thought.  On further probing of the roller race, I realise that the 2 thou feeler was not actually going through the gap between roller and track.  This was at the bottom of the track (where greatest wear should occur) with the crankcase inverted so that the weight of crankshaft and flywheel would be pulling the roller away from the track.  So the gap is something less than 2 thou.  I tried at other positions around the track with the same resullt.
Plastigage of the centre main bearing shows a bit less than 2 thou.
So I am going to live with what I have.
Regards
Graham.