I know I got killed with mine even on a bullring. Ran at Shellhammer's about 1/8 mile high bank high bite and Snydersville 1/12 mile flat no bite track [I was a Yamaha Light and Heavy champ against 12 Yamis at Shellys in 2010 and have many 4cycle wins at Sville, kart def. wasnt out to lunch] .... At shellhammers the leader went 8.9 I ran 9.1 in feature, at Snydersville which is more of a drivers track John Garde ran 11.67 and Andy Pritt setting fast time with 11.58 with me doing a 11.85. At both tracks I would destroy them in the corners especially at Snydersville by 5-6 kart lengths, they would just eat my alive down the straightaways though.
I ran it just to run it, I like giving my Yami a good run, probably not the right motor for the situation, maybe a 2nd one for it would be closer, but these new motors the UAS guys are running are wicked fast!