Suggestions on which plugs to go with

Newbomb Turk said
Ok Bewy, tell me what is a C63 Champion?

Been that way since at least the early 1979’s because I was using them.

Later today I’ll post a full list of all the fine wire plugs Champion made and some are still made.

Wrong again.

We used the thin wire plugs in our 2 cycle bikes in 1975, if you had a 2 cycle that's what you used, less prone to low speed load up.
I was a 13 year old kid racing a Bultaco 125 Pursang mk8.