Wilsons Sandbox

OK I'm sure this is another topic that's been beat to death but I can't seem to repair a flat motorcycle tire without creating a pinch flat in the tube! I've read all kids or articles about changing the tube out. I have three nice big tire irons and I spent 4 hours in a 105F degree garage on Saturday trying to get the darn thing in without puncturing it. I've tried four different times now on two different bikes and everytime I end up with a pinched tube and get pissed off and just take the wheel to a shop. My technique seems to be consistent enough that I always pierce the tube when getting the last 6-10" of tire bead onto the rim. I've tried no air in tube, some air in tube, pressing the tube up out of the way before pulling the bead over, but I always end up with the same result a pinched tube that doesn't hold air! Thanks for the help, Barry (The tire changing loser) '91 KLR650