Could someone educate me a little on the timing sequence difference between the Revolution and the Evolution Engines? I once read (but have forgotten) that the air cooled HD's had the "Potato, Potato, Potato..." sound because after one cylinder fires the next one doesn't fire until a 415 degree rest or something like that. So I can sound like I know what I'm talking about could someone tell me what the timing sequence difference is between the two engine designs? I recall something like the airheads firing at 415 degrees and then again at 115 but it was a long time ago that I read it I and forgot the facts and I hate sounding like an ass when talking about stuff like this for obvious reasons. Thanks in advance!