I'm at 600 miles now and did another oil change today. Swapped out all the washers and gaskets and so far it's oil tight.
I wanted to change the gear and clutch oil, since I forgot to do those at 300 miles, but couldn't get the gearbox drain bolt off. The only wrench which came with the bike that nominally fits it is too big, and with the brake pedal in the way I can't get at it with a ratchet. So I'm off to the hardware store for a more precise set of wrenches.
I do find it odd that a bike with metric bolts would come with English measured wrenches.
Jeff