Hi Viken,
How's the COLD weather treating you?
Nice bikes. I love the old Yamaha 2 Strokes. I had a '68 DT1 with an RT3 engine in it not too long ago, but got rid of it (for some stupid reason...) once I got it running decent. I have a '78 KZ650 now and a Yamaha WR. Have you checked out the yamahaenduro.com yet? I learned a ton from that forum....
What year are those? I have a few manuals if you're in need...
Welcome and hope to see those on the road soon!