Still can't see how it is running too lean. I get white smoke on hard acceleration and the engine temp stays pretty constant. I have only turned the high/low needles enuf to get engine running during breakin. As i got near the end of the breakin period, the engine idled faster and I richend the low end to compensate. After 10 tanks, I barely turned the high speed needle and this engine really moves. Like I said before, real tuning will come spring time when the weather is warmer. Maybe with the cool air the engine is running richer than it should. I dunno but I wont be running this engine again until all the snow goes away!!!