Reading sparkplugs

[rmsnoel]

I found this cool video on youtube and may be of help to a few. All comments welcome

https://www.youtube.com/watch?v=fiMM2S0aADM&feature=youtube_gdata_player

[TurboTobz]

Surprisingly a lot of people don't know/understand this, it's a very good technique

[rmsnoel]

I thought I knew about plugs until I found this. Mine were always a nice tan colour and Id pull no.4 every now and again to watch for overheating or oil burning (mostly oil burning)

Now Ive the bigger tb on its a clean white plug though the base ring is black. I cant see the other marks yet though

[GP82]

Half the vid is incorrect, for example ground strap does not indicate heat range but spark lead. Anyway inspecting a spark plug is the most accurate way of telling how good a tune is and this is not jus' WOT tune, but all engine conditions. More accurate then a afr, lead or egt feedback in my opinion.