As I restored an 1983 ATC70 I was getting no spark. I traced it down to the coil. I could not find any videos that focused on what coil to buy so I made this video to help others that may be having problems or want to avoid them.
Here is where i got mine. It was hard to find a good 6v coil. The ones on eBay said 6v but were either 12v or bad out of the box. hondaatc70.com/products/78-85-reproduction-6v-coil