I'm flicking YS 1.40's and a OS 1.40.in 2x2's at the mo'
The OS 2-stroker is far more thirsty than the YS's yet uses cheaper fuel and basically requiers zero fiddleling... but then again is more noisy. Both use Hatori's. After having a love hate relationship with YS over the years I was hoping for more from the OS. Right now it dosn't compare to the YS's...
sure it's powerful but so are the 4 bangers.

I suppose if I'd be using 2-strokes for years I'd feel a little freaked by a temprimental YS in the nose. It all ultimately depends on personal choice.

PS. I unscrewed the pump screw 1.5 turns on the OS. Much much better than standard setting.