the one made by RAM does just what you want. Tower Hobbies sells them: http://www2.towerhobbies.com/cgi-bin...1&I=LXDZ82&P=7

I've had good luck with it on a Saito 180... I wouldn't see any mods needed to get it to work on the YS....you're just going to end up burning up those OS F's a little more frequently (I went thru 2 this year over about 5 gallons of flying)...but works great!