Bass1, I have broken in quite a few YS engines just last week a new 110 also. I think your main problem is that it is just too rich. You may have to leave your glow starter on the engine for the first tank or two at 3 turns out it is just too rich.

But now that you have a tank of fuel run through it you can start to lean it out. I would say go to 2 turns out on the needle and run the you know what out of it. The 110 I just broke in had one tank through it rich and has been flying ever since and it gets better every flight.

I would peak the rpm's with a tach and then go about 500 to 600 rpm's rich and fly it. Then go a little leaner after a few tanks have been burned. But don't go too lean 200 rpm's rich is a good spot to stick with.

You may also have to lean the low speed needle a little to get it to idle best. Try to set the idle around 2200 to 2400 that seems to work the best.

Oh, I almost forgot, make sure to check the valve clearance. I have seen quite a few new YS engines with the valves too tight or too loose right out of the box. Also make sure your glow plug is good. New engines are hard on plugs. You may want to use 20% or 30% nitro fuel and make sure to use all synthetic oil. The higher the nitro the better YS engines Idle and transition.

Good luck with your new YS you will love it once you get it set.