Pretty cool quad in it's own right but what do you expect....show up on arguably the coolest Banshee site and diss a crapload of longtime contributing members while trying to sell your shit without an eBay Final Value Fee.
http://www.motorcyclistonline.com/performancedata/122_0108_pdataresults/index.html confirms that your motor puts out a respectable 137HP. Respectable for a modern 750 that is. My '05 ZX10r lays down 170HP, but I have a good one...
The reason your speedo shows you going so fast is that it reads off the countershaft. Those wheels have a lot less roll out than the 190/50/17 rear wheel that was original for the bike. I'd estimate you are going less than 3/4 whatever your speedometer reads....
But I'm sure you know that since based on your written prose, you sir are a rocket scientist and have already considered that probability.
Funny how it takes a motor twice the size to get close to the performance of a decent lightly modded Banshee.
Good luck on your sale, DoucheNozzle.