Ok, my bike runs fine, well I assume so because I've only rode my own. Low and mid range acceleration is great, but it seems to hit a wall near the top end. It almost feels like a limiter is installed or maybe the engine chokes a little. I ran out of gas today and had incredible power and speed between the sputtering. So I assume I had a temerary lean condition (lean means more air correct?). So I was wondering how I can adjust my lean/rich mixture to find the ideal ratio. Is there a screw or something similar to the idea speed screew? I do have the high flow K&N style air filter and regular muffler.