Thanks for all the replies...

As for the transformer/coil. I could wound a 500+rev. on a round ferrite core but that would take an insane amount of hair pulling. Since I read somewhere on one of the posts that others have use normal coils. And the most recent one was from a 12vlt strobe light adapter.
Wella, I happen to have a few right infront of me. I pulled them out from discarded scanners. I used them as light source and they look very bright at night. Not too great for trying to read a book but will shine great.

This adapter would work with my CDI since I wont need it to go higher than 18000 RPM.

I hope I am right ?