I'm in the process of ordering Red Line motorcycle oil, 20W-50. Maybe one bottle of 20W-60 too when they had only 3bottles (almost 3 liter) in stock 2500ppm zinc....
http://www.redlineoil.com/product.aspx?pid=110I hope clutch and gearbox will behave better. The ester based synthetic will fit my very warm engine too, 100-120C.
I'll report the result... hopefully smooth clutch without slip and smooth gear shifts, finding neautral when warm/hot.