Actually, I think the cause is the leverage on the kicker after it hits the peg.M.F.D.B. wrote:When the kick arm hits the foot peg, the energy travels in a straight line, from you knee/hip, etc. to the foot peg, into the frame...
The one exception to this is a back fire pushing back against your foot. Unless the bones in your feet are stronger that the case, your foot breaks first, simple physics...
Learn to start the bike just short of hitting the peg. Lean your body forward so as you kick, you stop before the peg.