Originally Posted by Mudguts
That would be a big no , 690 trellis perimeter frame 450 ,530 back bone frame
There be a hell of a lot of chopping and welding , it would be easier to fit a 450, 530 motor in. 690 frame .
If I get seriously bord one week end I might see if my 500 motor will fit in the 690 but that will be when the 690 motor is out get a 730 bib bore
I would be most curious of this!!