Spark plug?

Also it might be worth mentioning that if you get too many results for a search, just pick one that seems close, then look at the list of "Similar Threads" at the bottom of the page. I often find that the system has somehow found more accurate targets.

Good advice I had not even noticed that feature!

spark(ing) plugs

The NGK gold-paladium plug lasts longer and is very resistant to fouling, e.g. I could ride twenty miles with a soaked air filter on an F7 Kawasaki when I ran a B9hv plug, and perhaps half a mile with a B9hs - oh, and the v-plug lasted four to five times longer, also.
(F7 = 1973 rotary valve 2 stroke single, 175 cc. Match-ported during initial rebuild.)

I can guess what comes next, and I have the URL for an answer:

Use the NGK B6HV plug. They might well be spendy if bought individually (6+ bux) but if bought in boxes of ten, the price break is quite substantial. (Group order?)
If I find a thread I like and think is useful I will vote on it, so I can spot it faster next time I am looking for that info.