Too Lean?

Noticed yesterday on ride that she seemed a bit lean at near full rpm e.g. main jet circugit.=14pxPulled plug for a look.
Cylinder 1 is far and away the worst looking plug. Not sure why it's black around diameter.
Oil consumption has dropped to *nearly* zero, but me thinks cylinder is the burner.


From my POV, 4 is optimal followed by 6. Worse is 1, 3.
 

Thinking about running a slightly colder plug, BP8ES on 2 - 6.
 

 Of course, this is running around at sea level, and pretty sure this motorcycle will never receive death Valley or lower elevations. Still, I sure don't want a hole or piston.

Note: Stock jetting, but 6-1 DG Exhaust.
 

The last time I pulled my plugs, they all looked like your suspected lean ones and I have not altered the settings other than the idle mixture. I assumed that it left the factory that way. I'll pull mine again in another 3K or so when they're due for a change and see how they look.

Ted wrote:

The last time I pulled my plugs, they all looked like your suspected lean ones and I have not altered the settings other than the idle mixture. I assumed that it left the factory that way. I'll pull mine again in another 3K or so when they're due for a change and see how they look.
 

Thanks for the reply Ted. I have ordered some BP8ES plugs, a tad colder and will report back when my temp work gig ends in about 8 weeks.

I would have thought that the spark plugs are just showing the symptom ( slightly weak mixture) and are not the cause.   I’m sure you know far more than me about these carbs, but are all the needles the same size / taper, and do they have the same thickness of little washer under the clip? 
I guess incorrect ignition timing need not be considered, as two of your plugs are not white.  Just ignore me if I’m talking ********.!