My '02 620 wouldn't run with the stand down either. I fixed it with a length of wire, a diode and a few crimp lugs. It allows the engine to run with the stand down in neutral, but kills the motor when you put the bike in gear. I'm guessing it's the same as the Evoluzione mod but it only cost me about $3 to make. I've got a Word doc that shows you how to do it with a wiring diagram but I can't work out how to attach it here. If you want it I can email it to you.