Wow, lots of good info and a really neat engine but I'm suprized nobody mentioned prospark yet... I put one on a saito 180, helps out a bunch with the vibration and fuel usage... not to mention it runs great on low nitro fuel. Not that it's a powerhouse or anything but I don't need to feed it 30% anymore just to make it run right.
Might make a good retrofit on a YS160.