I'm not a Harley rider (though I almost bought 883), I recently started to ride and my first bike is Honda '06 Shadow Spirit 750. I either wave or nod my head to other riders. Had some Harley guys not wave back to me; had some wave first. But to be honest, down here in Coral Springs, FL I get more responses form guys on sports bikes, perhaps because I see more of those around.
Ride safe guys!