I am looking for a site that gives horsepower of various different motorcycles all on
 

site.?

there r a few site that will alow that but all you have to do is look up what kind of bike you r lokking for cause yer just do it...

here is a list from Motorcylist magazine:http://www.motorcyclistonline.com/performancedata/

one of the best sites for specs Bikez.com - Online motorcycle catalogue describing more than 10.000 bikes and 150 brands.