And after re-assembling and bolting down the head and cam, putting the crank at TDC, and pulling the forward side (the "pull" side) of the cam chain taught, I found this:
You can see that the witness marks on the sprocket do not align with the gasket mating surface. I'm pretty sure this means the cam chain is stretched. I posted this pic in the main XL600 thread for feedback, and I'm including it here just for continuity.
Current Bikes: 2006 KTM 950 ADV S, 2002 XR650L, 1988 Hondasuki KLNX250R
Previous Bikes: 1986 Honda XL600R
,Honda XL250R (2 of them), Honda XL600R, Kawasaki KLR600, Honda Nighthawk, BMW K1100LT, BMW R100GS, BMW R60/6, BMW K75, Husqvarna 430XC
for my Cummins 4BT International Scout build thread www.christianristow.com