I'm still in the first 1,000 miles after rebuilding the 350 K0 twin, and I can't seem to clear up what appears to be an oil seep from the RHS of the head gasket. The top end is pretty much tight, and it certainly isn't blowing, but every time I give the bike a good run out, I return to find traces of oil on the top fin or two of the cylinder block right hand side. I should add that for a short while, I had a leak from the tacho seal and earlier it suffered from sealing washers that weren't on the top of the engine. Must've been like it for a month or so (which I originally thought was caused by the head gasket) but stopped immediately when I replaced the seal/replaced the sealing washers.
My question is, are the 350's known for leaking from the head gasket, or have I just saturated it with oil from the tacho joint? I know the oil feed to the head is on the right, and I'm wondering whether that's a known weak spot. I'm guessing it could be old oil drying out from the gasket, but I'd've thought that would've dried out within twenty miles or so with a hot engine.
Or should I just wait another few hundred miles before I start worrying about the oil traces . . . ? Meanime, I'm considering trying to find a set of heavy duty engine studs - any good sources out there?