I had a few false starts too with this but finally got it going. Yes, I think the 6v is generally fine. In my case though the generator and battery were bad. I had a good 12 V battery around so it was actually more economical for me to convert to 12V. The kit was about $100. It turns out that the starter is tough enough to stand up to the 12V and did not have to be swapped. This seems to be common practice according to the various tractor sites and the kit instructions. It does turn a bit faster and I think it makes it start quicker. The needle and seat in the old carb was also shot. New parts there did the trick. Wish it had a little more power though, it slows quite a bit pulling a bush hog up a hill. Especially when the field grass is long. This is a 9N maybe your 8N is stronger. Didn't know you had a Harley. Let me know the next time your passing through! Got my manure spreader going too. Who doesn't need one of them from time to time!