So, I'm almost positive that the stock wire was just that, a stranded copper wire. It terminated in a stiff, solid wire crimped around a brass collar, and that collar fit over the threaded plug post, then the fat plug post was screwed on. Man, I wish I'd known that post unscrewed before I cut it all off! Do you think you could do me a favor and measure the resistance of your 50V's plug wire? I don't want to burn out my coil or anything.
Anyway, sorry to hijack your Columbia thread, it sounds pretty sweet. The water cooling is passive, right-- no radiator or pumps? Does the improved cooling let the engine rev higher?