dyou have smellovision then?
its fine if you get trackside, the big fours use a nice race formula oil with a similar haze of castor of old,
castrol r was the bomb,then im sure silkolene and castrol produced a castor styled synthetic top/fuel oil which hazed off in a similar odour,.
i have 15 litres in my garage of fine bean oil castrol r30,,yummy.
anyways,the 125s and 250s are still screamers and strokers,and they are still gp.