Two years of putting up with the mighty YS beating them around the head and they've finally developed enough slop (still less than the s9650's in the stab from new) around neutral for one of them to break into the flutters at times.

I repacked them with grease but the slop quickly returned within a few flights so have swapped the horn around and reset "neutral" vie the subtrim and hey presto got my nice tight neutral back but have ordered new gears as long term fix (only about $10).

Glad that brushless motor in there's going to spin 5 times longer, long after the gears have ground to dust.

Seriously though, does 2 years from aileron servo's in a YS powered ship sound about right? I had to do the elevator gears after about 2 years as well, while the rudder servo is on original gears (3 years) but I've done the neutral shift on it once already...

It all depends. I have a brand new BLS154 stop working on one direction two weeks ago after only about 20 flights, and others have had over two hundred flights before require servicing much like yours. All on YS power.

Adrian