Years ago when I rode a Yamaha Cross Country Sport 305 on the road and in recent years of trail riding dirt bikes I don't remember ever being aware of counter steer or using it: I just leaned in the direction of the turn. But after a friend told me to try counter steering on my America I was amazed at how quickly the America starts to lean and turns toward the side on which you push the bars and what little pressure it takes. The whole idea seems counter intuitive - to push forward on the right grip to go right - but it certainly works.
So....Does anyone have a simple explanation of the mechanics involved? I assumed it had something to do with moving the front tire contact patch off the line of travel, but the effect is so immediate and so strong that it doesn't seem the contact patch could be shifted so quickly.