Wifes' cousin blew a piston in his Wifes 99 zr500. He was just about to move her up into a firecat anyway, so he's not gonna fix it. He offered it to me for $300 just to get it out of his garage. I don't really need another one, but its in fantastic shape so I can't turn it down and can keep it around for another back up. Anyway, I have a spare 98 zr600 in the garage that I use as a parts sled. Still has a complete drive train in it. What do I need to drop it into the 500? I know the bottom end is the same anyway. They are both Efi. Do I need to swap the ecu over? Anything else?