I bought the pumped 1.20 when it first came out. It ran perfectly when the pump was working. To wake up the pump I had to push and pull fuel through the system with a syringe. I never had it apart, all it ever needed was to get something inside the pump loose at the start of the flying season, then just run it at least weekly after that. That engine will pull 9.5 pounds straight up to Jupiter with a 15x6 prop.
I understand that the YS is King of the Hill now, in this size range. If so, they must be truly awesome...
I never had to "set up" a quality model engine that was brand new.