My first motorcycle was a 1967 Yamaha AS1C 125 twin. Being 15 years old I found the Yamaha with auto lube would foul the plugs and then with hard use melt the piston I found out a twin was nice because I could limp home on 1 cylinder. As a teen I went to the next range colder spark plug and then went to richer jetting, then figured out this syn oil called Steen C chemical lubricant would end the spark plus fouling and all the other adjustments allow endless operation at wot which was 9500 or 10,000 RPM an about 70 or 75 mph on the freeway. Anyway does any body know exactly what steed C base oil was? Old people?