I have never ridden there and don't like going there.. traffic sucks.
I thought there was moto parking right near the ADA parking on the west side of the stadium, but can be positive. Google Earth??
No dedicated moto parking that I am aware. Lots and rates are the same for cars or bikes. If its a weekend event most businesses around the stadium offer their lots as off site parking.
Thank you all the parking advice. I wound up going in the Great America entrance. They charged me the full $25 but I parked by the gate.
The show was awesome!