I made a thread a few weeks ago chasing down a lean condition. I melted the same side down last year, rebuilt it a few weeks back and while trying to chase down why its running lean, I melted it down again. I started with 280s and went all the way to 360s with 0 change in either plug color (they are both the same color). I took it out for about a mile after switching to 360s, the egts stayed around 950-1100, I went to hit an end drive and when I landed, I pinned it and it bogged. I looked down and my egts were 2100ish and it was too late. I'm at a loss. Its a newly rebuilt motor, new seals, no leaks, new trail ecu, pj are functional, clean carbs, and 91 mixed 33:1. Also, I can't get my tps to relearn. Even with a 470ohm resistor. Keep in mind, these were a mile runs at a time to check plugs and jetting. I let it warm up 10 min each time also. I'm about ready to throw in the towel.