MerlinDudley
XS400 Addict
You say the bike was "Layed Down?" I'd say that the motor took most of the torsional stresses, and that caused the bent frame? I'd be very careful, with lining up the the donor parts of the other frame, though! Putting the empty crankcase in there wouldn't really help in aligning the donor parts, unless you have the top end attached too? You may still have handling problems, even if things go right for you, when welding everything up? You really need an alignment jig, to get all of the frame geometry spot on! I tried something similar on a late 60's CB77 it never really handled properly, after the donor parts were welded up! I ended up selling it, after six months of riding on the road! The 77 frame, wasn't as badly bent as your's is! I just thought that I'd pass on these few words of wisdom, before you do things too drastic?
I hope this has been of help to you?
Merlin
I hope this has been of help to you?
Merlin