I have noticed that the spark plugs I pull out are fouled and black - these plugs are the tr-8s (NGK - 4554s) - I’m getting a bit of hesitation at lower rpm- buddy told me to replace with the NGK 4091s (hotter) gapped .028 to see how she acts. It has a street tune currently- it’s a new build. - thoughts anyone??? Thanks for any advice
Badz
Just trying to see what opinions others may have on this. I’m going with a hotter plug to see if this helps before it goes on the rollers.
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