Agip Kart is light years ahead of A747, the castor component has been refined to greater degree. There will be less verticle lines from inclusions, on the piston skirt with Agip than A747. Agip is cheaper to. Plenty of riders are using Castor/Sythetic blends(A747, Maxima 927 and Agip Kart) in oil pumps with no adverse effects. I use Agip kart in my vintage mxer that only revs to 6500rpm and yet to find any deposits or plug fouling(that's down to jetting and ignition anyway). Have an old cast iron cylinder in my shed that stayed rust free for about 5-6yrs after only ever running on castor, the bore was 'wet' and greasy to touch for ages.
"if you want to go faster, use castor"