inspection · FF-0582

What does Robert King look for when reading a spark plug from the ARDUN?

Robert pulls a plug for a quick look after the first pulls. The passage is hard to follow in the captions: the center holes are said to be naturally the lean holes, the center holes are always the lean holes, and the remark that follows is left as captioned.

Expert

Robert King

Evidence

expert attributed

Component

spark plug reading

Applicable scope

Engine dyno session at Klein Engines, shown on Steve Coppock's naturally aspirated ARDUN Flathead