Hi Hugh
Ah yes......... brothers with bikes, mine has an Aprilia RS250 that has been "upgraded" somewhat. Apparently it has a powerband of only 3,500 rpm and really flies at track days (for which it was bought, good idea I think, after being creamed by a stolen car on the way to work one day!).
I hope to try it out, just for old times sake, being an ex racer and all, this bike is apparently good for a genuine 140 to 150mph, depending on the length of the straight, amazing for a 250! Also being so light, it outbrakes and corners the bigger bikes (providing that you're willing to try that hard).
Cheers
Ian