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@Jung seems to be to a degree. Normally they’re just assembled poorly. Some people report new bikes that drain oil.
Anyway, seems like I got to the bottom of it, literally. Sump gasket seems to have given up the ghost. Easy enough fix, apart from removing the headers first, which means removing the header studs and bolts.
Out comes plus gas...
Chak
I changed all the driveside seals on my Triumph just after I got it, and it was concerning just how little interference was involved with the interference fit. Maybe that's why they demand that the rider drain the oil before just about any maintenance task: it's usually already drained anyway