I will admit there is one time of year that pretty much all bikers wave all the time. That is the first really nice day of the year when you see a hundred bikes on the road. I think the joy of finally getting the cover off the bike and the feeling of riding again makes everyone happy. No matter what you ride. Even the scooter riders get waved back too. I wave at the scooter guys myself but it is amusing to see baggers wave at them on the first nice day. About a month or two in to the riding season the waves begin to dissipitate. Must be that we are getting used to the novelty of two wheels again and loyalties become stronger.
What baggers usually mean when they wave to me.