Hi only new to the site; have some additonal pictures that may help from 70's.
A couple of these have been taken from old movie frames we have.
My uncle and father Peter and Colin Laws are shown in a couple. Peter raced a hagon sandracer short stroke Jap, he also raced a factory yamaha yz in a hagon stroker frame (the yz one of the first I believe, only 5 were bought into Australia, Peter owned one, the rest went to motorcross riders, 50 released worldwide). Colin also used to race a hagon stroker with a later model yz. Peter raced at a national level on many occations. Napean being his local track, he was recorded form the tower at Napean raceway with a lap time 28.9 seconds, the only difference in the track at that time was a more prominent right hand bend after the speedway corner, making the turn more difficult if anything.
Here are some photos;
This one, 1971 Napean, 1 Bill Macdonald, 49 Kevin Fraser. This one 1975 national titles griffith. 96 Peter Laws, 297 Keith Davies, 25 Greg Primmer. Not sure about others?
Here are 4 Shots of Peter Laws taking the speedway corner at Napean mid 70's, this shot also taken from film footage.
These four were taken from Ameroo Park 72 or 73?
Terry Pool Carl Askew
Carl Askew No2. Trevor Hunter in background No.5 ?
This one was taken from Nemingah Tamworth 1975. 96 Peter Laws, 375 ?, 1 Keith Davies.
These two also from Nemingah Tamworth 96 Peter Laws
I have to also throw in a couple of articles from Revs magazine back in the day Peter Laws takes event
This image is of Colin Laws Kempsey NSW titles 1979
These two also of Col at Napean 1978
This last one is from Ameroo Park Year ? 26 Bill Macdonald, 40 John Langfield, 149 Doug Platts.
I had to add a picture of my newly restored hagon stroker with 1974mx250A.