Changed these 2 weeks ago to monitor.. Left front / right rear - valve guide gasket?

 

What year? '05?

 

If its a 05 might have bad valve seals on the rear. How many miles was it?
when i built my 05 there was a 1/4inch layer of oil on the pistons with only 7,000 miles on the clock.
if not disreguard this message.

 

I think you've got it nailed.

 

The takeaway for me is that you need a new dealer.

 

Rear plug is normal. Front looks like it could be oil, but is it wet? Hard to tell in the pic. Also those white specks indicate detonation. The white on the ground electrode indicates very hot running.

 

Put the HD brand plug in the engines, run 3,000 miles on the plugs then let the dealer take out you plugs. Some dealers can be sticklers for not using HD brand on their bikes. The plugs you are showing don't seem to be HD 6R12, never seen their plugs with a "7E" on them. But the plug with the black on it is showing something else is being burned besides gas. My 05 had the valve guide seals replaced on HD's dime, the plugs looked much worse then that and oil was being consumed. Don't want to start a spark plug war but try the 6R12's see what they look like. Good luck.