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

Have you moved you low end adjustment dial yet? I have a Moki 1.80 with a Cline, Morgan FAI fuel and OS type F plug, and just yesterday was trying to tweek my low end. I could barely move it off the center tick in either direction without it being too lean or too rich. Very sensitive. A rough idle is usually a sign of the low end being too rich. But your transition is so good that you don't want to change it right? Mine won't transition perfectly yet. It's a little rich and also idles kind of rough. My transition hesitates slightly after idling for more than 10 seconds. If it doesn't idle for long it's fine.

Also, does your idle take a while to settle down once you put the throttle stick all the way down? That also usually means it's rich.

Joe

Joe - No, mine throttles right down without hesitation. As far the your question about whether or not I've moved the low-end dial - I leaned it until it would quit as-soon-as I hit WOT after an extended idle and then richened it until it would stumble (with lots of smoke) after idling, and then set it right in between. Like with your Moki, the dial is very sensitive. I sold my used 1.80 to a guy at the field and that thing idles so smooth it doesn't bounce the plane at all. My plane at idle shakes so much it looks like it's having some sort of convulsion.

Dan

Dan,

Maybe you're still on the rich side of that range you found (lean to rich). I need to take mine out and play with the low end again. Now that I know where MY range is I can tweek it between the extremes. They are so close together it's rediculous. I couldn't believe it when I discovered that. I was afraid to play with it anymore thinking I might screw it up but I need to get it better. It smokes a lot and stumbles. Also my idle is rough and is slow to get there.

Joe

Try 5% and a new plug