Nathan, Lean your pump an 1/8-1/4 turn and then try it. Both my Focus and Icepoint fly on 1.60's and
I never have a problem hand flipping them even on the first start.

For A .90 size plane the OS 1.20 AX is hard to beat, Excellent power and easy to use, with a pipe it will
pull a 10Lb plane vertical and out of sight. and swing a 17x10N,For less than a YS 110. or Saito. I have
heard alot of gripes from pattern pilots about the Saito 1.25 in a pattern ships.
Most of the Northeast pilots use the OS 1.60 or 1.40RX or Electric so getting LIVE help with a YS might be hard.

As for the YS 110 being the best of the 3 engines I don't see alot of difference between the YS and the OS 120 AX
except in where the power comes in. The OS likes to rev more and the YS makes good power in the mid RPM
Range. If you pipe an 1.20 AX you can fine tune the powerband with pipe adjustment. and it will have just as much power.