I raced it yesterday,it screams on top and needs a little more on bottom.I still got it a little rich on bottom.I going to get some stiffer clutch springs and alum. shoes for the race next sat.and see how that goes.I couldn't run a 6 min. qualifer without pitting for fuel so it's not getting great mileage either, this is on a track that you run wide open most of the time.