Cramac Mach III is the very best oil I have found for small engines running gas that do not have an internal wet clutch.
I do not sell it, but my son won a championship with it in his Yamaha 4 stroke OHV kart engine.
Red E oil is also very good, probably just as good as MachIII, but I don't have enough personal experience with it to give it my seal of approval.
These oils WILL NOT WORK in a Legends car. They are too slick and will mess up the clutch.