Nippon Denso X24ES-U (4099), 115main jet, 38 slow, needles are where Mr. Honda put them. No plug fouling.
Edit: I can read… and I have a K1. I expect this combo will work for K0 as well. My K0 fouled plugs just like this K1 used to, and a hard ride on the highway would clean them.
I saw in your other thread ekpent couldn’t recall this plug number. I have to look it up too, because I need to replace them so seldom.