Ripped apart. Not exactly, but if I'd gone to the length of taking the engine completely out (as Craig did), yes I probably would have split the cases, at least to check the seals and seen how much play were in the bearings.

Your bikes seem to have had less than 5000 miles on each bottom end John, so if that was me, I'd have probably left them as is, unless there was some issue like starting due to lack of crankcase compression.

That's why I asked Craig what mileage / km was on the clock. If its say 'high mileage' of 15,000 miles + with unknown history, I would definitely have a look at the bottom end before embarking on track days.

Once the engine is out, its not exactly a difficult job, even first time around.

But all of this is much less of an issue if you have 2 bikes to take to a track
_________________
Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30