A couple of different Ossa powered bikes appeared around that time, they all suffered the same problem. That engine was never going to produce the power that the works bike from a couple of years earlier did and by that time anyway, a single, no matter how good, was not going to be competitive anymore.
I remember also a couple of Ossa powered machines floating around in the early 70s.
Unfortunately they were based on the MX engine and as I recall, the bike of Santi Herrero was a completely different animal, and as Santi had engineered/developed/rode the GP bike it progressed beyond recognition from what was available at the time, it had the legs on the factory Yamahas of Kent Andersson et al.
After Santi sadly lost his life at the 70 TT, the 250 Ossa fell by the wayside GP-wise, perhaps it had reached the end of its development, who can say now?
I also recall someone building a 500 twin based on the Ossa, another world-beater which never got off the ground due to the twin rocking couple being completely out of sync, was it a Sanglas, or something similar?
Edited by exclubracer, 16 January 2011 - 22:51.