My 2.10 idles very rough. In fact, it idles rougher than the 50cc gas motors at my field. I can let it idle for 4 or 5 minutes and then hit it WOT with a smooth transition, so the low end adjustment seems to be right. It smooths out nicely when it's running above idle. I have about 3 gallons of fuel through it since completing the breakin. I'm using Omega FAI fuel, new K&B 1L plug, and Cline regulator. Any idea what's wrong?

Thanks for any info.

Dan