by crfsonly » Fri Jul 27, 2007 5:53 am
litleboy has it about right. when you land on the rear tire it acts like a pivot causing the front tire to rotating around that axis...the end result is the front accelerates creating a greater downward force. you can lessen this effect by accelerating the rear wheel on contact. timing, throttle control, and body position are key to pulling this off successfully (read: without injury).
ken