Moe,
It happens at all levels of fuel, but I generally try to keep the fuel low (ie.less weight). Also, turn 9 is generally lower RPM as I am carrying alot of speed downhill and am not pulling at all. It does not happen in all left turns.

Dan,
It seems to happen as I am excellerating out of a turn (left turns possibly) and bogs when I hit 5500 rpm. I will be looking into fuel related issues next in addition to the flywheel and speed sensor.

Unfortunately, I won't be on any tracks that seem to bring out this issue for some time.