ORIGINAL: HighPlains
Plug on right has dry surface. LEAN LEAN LEAN
Yep.... lean run on that.
The other looks cooked too. Distorted a little, but mainly cooked.
500 rpm off peak is not enough. If you cant needle back down at least 1000 rpm before it falls off of the pipe, pipe is too short or the prop is too big.
Suggestion here is add a few head shims (.010 at least). And back down off the peak a bit more for launch.
As noted, 8oz of fuel should give you no more than 4-5 minutes of full throttle flying time with your setup. Consider at least the last 2oz "unusable fuel". Running the tank dry is a sure-fire blown plug.