From http://www.iomtt.com/

Isle of Man TT Results   TT 1973, Lightweight 250 TT Posn Rider Name Machine Time Speed DNF  Roger Sutcliffe Ossa 0.00   TT 1972, Lightweight 250 TT Posn Rider Name Machine Time Speed DNF  Neil Tuxworth Ossa 0.00   TT 1970, Lightweight 250 TT Posn Rider Name Machine Time Speed DNF  Santiago Herrero Ossa 0.00   TT 1969, Production 250cc Posn Rider Name Machine Time Speed DNF  Trevor Burgess Ossa 0.00   TT 1969, Lightweight 250 TT Posn Rider Name Machine Time Speed 3 Santiago Herrero Ossa 2.26.21.0 92.82 DNF  Trevor Burgess Ossa 0.00   TT 1968, Production 250cc Posn Rider Name Machine Time Speed 1 Trevor Burgess Ossa 1.17.53.4 87.21   TT 1968, Lightweight 250 TT Posn Rider Name Machine Time Speed 7 Santiago Herrero Ossa 2.27.42.8 91.97 DNF  Trevor Burgess Ossa 0.00