This is me behaving irresponsibly, breaking in a new engine on the race bike. 1967 Honda twin, 210cc, two valve, 26-27 hp at 14,000 rpm. My two Border Collies were escorting me ... had to shut down early when I saw the truck. Turn up the volume ... the engine sounds nice .... to me anyway.
http://www.jrbranson.com/cb175-test.mpg