Fox Engines
I just received the current edition of "Engine collectors Journal" which features a history of OS and that companies rise to dominant. (as an amateur historian I find it interesting that the entire history of Japan from the late 30's to 1945 did not happen:-) . OS has produced some very fine engines (I am particularly fond of my 1.08) and in huge quantities. This provides us modelers with the economies of scale. There is, however a down side. As a parallel before the brilliant "You meet the nicest people on a Honda" ad campaign coupled with Sochihiro Honda's acumen there were scores of interesting motorcycles produced worldwide. Now Norton, Montessa , BSA, Bultaco, Husqvarnia and scores of others have been replaced by the UJM (Universal Japanese Motorcycle).
I have greatly enjoyed a number of different motorcycles and model engines from many manufacturers. The choice is much smaller now. I hope it grows no more limited.