I asked a while ago if mi bike was running rich, as t'end of mi can was sooty. Just changed mi plugs, and these are t'owd uns. Looks like it's running oreyt to me.
Toasted marshmallow brown is right on the money for A/F. Look under magnification for any black speckles as that is a clue to detonation under load. Your pics don't show any but they are blurry. The toasted brown should go down the porcelain - so cut the plug to see. The dry black turn of color on the first thread ring is good also, showing slightly rich, not lean. Middle plug is best in the bunch. Biggest concern is oil on the threads, perhaps p-ring issue. Tough to see timing mark in pics so Ill assume that is OK. You may want to put fresh plugs in and do a wide open throttle blast down the road, then stop and pull them. Idle and cruising can cover up true coloration under load.
They look fine to me for EFI usually EFI will colour them a light gray so a tad rich but i would rather rich than lean.
^ True. My bike is EFI and I use ethanol free petrol. Mine comes out soft gray on a TTP Tune 3 map, but I used to own a lil sportscar that I ran nitrous through and standard copper plugs - toasted brown was the rich AF on that car. So brown or gray depending on fueling, plug type, etc.
That's funny, cos I had a mate int Navy, from Somerset. He lived in a little village called Dinder, between Shepton Mallet and Wells, and no one there could tell a word I were sayin!!!
Yes i used to be into mad fast Japanese turbo nutter cars...built a few and did my own mapping and plug colours do vary with fuel type etc always used wide band lambda sensors to be sure when running 26psi of boost...too easy to go bang guessing it.
