Arc Racing has them direct. They have coils too.
The Billet Rod I had made is T7075 alum for a Kawasaki FB460V with a stock stroke.
Now that I own the design, I was thinking of producing some but I do not see much of a future in it due to the phasing out of flat heat engines.
The Minimum run my machinist will do is 4. After paying thousands for the engineering work, I do not feel this will be anywhere close to being affordable to the public.
Probably will write if off as a learning experience/loss.
Now for the good news, So far, I have taken this engine over 7300rpm, and it won’t die, The Powerband is just plain stupid, it pulls like a big bore twin.