Much of what you offered coorelates well to what the websites offered but I was suprised to hear that it was competative with an Aprilia 125 RS. Unfortunatly I am not familiar with a 150 RR. As I mentioned I have an Aprilia 50ccRS now with the 75cc red head and all the internal mods I guess it puts out about 15hp at sea level; on a cool day it feels more like 17hp and really 70mph is acheviable with quite sane gearing I think its quite fun (from what I recall I haven't been on a cycle in almost two years) My other bike is a MV Agusta with an engine built by Ferracci all done in Mg, Ti ... ah well look up Mototek.com they actually have both bikes. I don't really want the complexity of a 250cc just a simple single cylinder 2 stroke with about 180 - 210 cc displacment, small, light with about 40-42hp and a top speed of 120-130 mph. Because this will drop to 30hp at not much of an elevation change or hot / humid day. But I appreciate your responses.