Thanks for the response guys;
Noel; the images you posted are of Col on his 74 yamaha 250. The frame was built by Stan Clarke, and previously owned by Kevin Sullivan. There were originally two frames made, the other was for Ron Mcenzie and raced by Kevin Frazer in numerous national titles with a 125 Bultaco. The frame was originally designed for a 250 montesa.
On the search topic, I have spoken to a couple of guys on the track and know of another two of these frames (Hagon Stroker for yamaha) none of which are in a race ready condition but there none the less. Both owners saying 'they are in the shed' Maybe Fraser knows? There are alot of sheds out there.
I'm sure you guys have alot of contacts and may know of someone riding one post 1980, NSW region.
I understand this is not going to be easy, with any help though I will be thankfull.
Jim;Classic sandracer, Weslake incl. shipping, will pay you back