I was sittin out back my work shop saturday morning about 7am. there is road construction around the area where I live here in Gilbert AZ.
I then hear the distinctive sound of an early 4 cyl bike with 4 to 1 pipe. He is puttin through the work zones 25mph limit. I hear him up shift casually, then throttle up at the end of the work zone. Not a hard throttle on, just brought up the RPM in each gear and the pipe sounded great
If it was not a 750-4 Honda , it was an early Kawasaki Z bike. Had to be. LOL
You middle aged guys know that sound