Mine is weeping just a bit. New OEM (I think) seal. Fresh rebuild. Will this seat in and stop leaking? I have a few hours on it now.

If not, I'll give a new seal a try. The shaft was a bit rusty outside the seal. I polished it on the wire wheel. Perhaps it has a small bend?
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MC21R9N track
MC18R2J track
CBR954
CR250