What do you think of this plugs, I think it works to hot, their are more grey than brown but the bottom ring is dark too?
If it's possible, post a pic from your plugs...?
My engine runs well with good temps of water and balanced egt about 1100-1150 F , great fuel consumption and brown or light brown colored plugs, what will I more. Never touch a running system, I think during this conditions the engine could be geeting very old :-)