I've used Denso X27ETR in mine for the last 10 years. They are a twin electrode plug which have always provided excellent service life and consitent performance.
The downside is the 18mm hex. I turned down a socket in the lathe so it would fit in the well.
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I could play Stairway to Heaven note for note when I was 12 years old.
Jimmy Page didn't actually write it until he was 22.
I think that says quite a lot.
853SP, F4 1000R #67, XL1200S, FZR250 #761
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