The K&B 1.00 is a completely different animal to the Sportster. Worlds apart.

I use McCoy MC59 plugs in all of my Sportsters. I have used Enya 3 plugs in a pinch (theyre hotter than OS 8 and F plugs), but as mentioned; the OS and Enya plugs are like a mid reach plug. Longer than a short plug but shorter than a long plug. As long as the plug is HOT and the fuel is right, they take whatever I can throw at them. DO keep the nitro to a minimum. They don’t need any, but 5% nitro does give a better idle and a little wider tuning window on the needle.

The mixture disc is very sensitive - centered is the base setting - use micro adjustments to get a good setting. Counterclockwise goes richer and clockwise leaner.

My current stash of Sportsters consists of a pair of .20s, a pair of .28s, a pair of .45s and three .65s. One each of these are new and unrun old stock engines. None have brass bushing in the crankshaft bore.