So I have had a closer look at the frame that came with the dodgy swingarm and shock. Looks like the rot continues.
I was given another frame when I purchased the "bike"
There are a number of differences, so I will defer to the experts on here as to which frame is more correct.
Pictures tell the best story.
Frame loops at the back
Airbox/chain guide
Frame A
Frame B
Frame Gusset Frame A
Frame Gusset Frame B - note slotted hole
I suspect Frame B is closer to the correct one, athough I note that the gusset part of frame A is the same as a YZ250B I have in the shed at the moment. The serial number is very early as well. Is it possible the frames evolved through the C model
Sadly frame B has had all the engine mounts carefully hacked off with an oxy torch :'( :'( just need to swap the mounts from the other frame.
Is Frame B the way to go ?