? normal burnt spark plug

CMF_1300cc

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is this a normal burnt spark plug?

 

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CMF_asdame

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any breathing mods?
is it new and recently fitted? mine looked like that for first 100miles and then after few hard driving the insulator would start to brown up from the acceleration enrichening.

if it stays white for afew miles even after some hard acceleration its running too lean
 

CMF_mycra

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Were they really 'professionally' done by racers...cuz those cheap plugs look stuffed
What's wrong with a normal set of iridium plugs @ 1.1 gap? The car is lean without a doubt. Even running air/exhaust mods with 257 cams for months, UNTUNED and won't be this bad....
 
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