ORIGINAL: mk1spitfire
Great.
A plug every run, is what I want to advoid. My 50v1 can go 10 runs at least. I had no idea to expect regular plug blows were common with well tuned engines
Common with high nitro, which I consider to be 40% or more.
If the element is consumed to a chalky grey/white, the plug died with honor. If the element is missing and all there is left is a smoking hole, then that is your indicator that something is wrong.