Having been rapidily introduced to starting a six volt in the worst of circumstances. Vehicle sitting for about two years since starting , with a reputation of being a bit of a cow before that, and an ualterable set time table to move. I don't see the problems! After a couple of gallons of fresh fuel , a decent battery the old girl fired up a treat. I had to play the choke a bit, but I've come to the conclusion she is running rich anyway. When I got home I changed the dizzy cap, very worn, the rotor arm , equally worn, much less problem. Follwing that a bit of emery on the points , re-set and a new condensor, she is starting very easy from cold and hot. So empirically the system will work anyway despite a lot of disadvantages, but when it set up right, no diffrence from a 12 volt system.