I know this is not very scientific - not a real plug chop - but the attached picture is a NOS Champion N6Y that was on my Atlas for about 40 miles running at speeds up to 65 mph. The gap is .020. According to the technical information on the UK NOC site this is the correct plug for the Atlas, gapped to (continued below the picture) .025. (I usually run a NGK BP7ES which is a dark malt color). What do you think? Is the Champion too hot?