Nah the bearings on my crank are all virtually brand new. The engine has only done 115km since the last full rebuild.

The bike ended up being sat in storage for a year and a half during my move to New Zealand. I found a leak on the crank case joint where presumably fuel vapour in the crank cases had (over time) eaten through the Blue Hylomar i used to join them. So i split the engine and rebuilt with new left and right side crank seals but this time i used Threebond 1207B to join to crank case halves.

I re-tested the re-built engine for leaks only to find (what looks to be) cross leakage as described above. But i really don't know enough about the subject to be sure and i've not found any answers in any of the posts i've looked back through using the forum search function. I've been searching 'crank seals'.

NSR-LOVER, do you have a new center crank seal to fit when you rebuild your crank?

I've no idea what the center seal looks like or how it fits - if anyone has a picture or could describe it that would be helpful.
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After years of moaning about immigrants now i am one...