FBDave, I have read some sticky .50 SK carb complaints, so first thing I have done to excersize the carb with manually many times to detect any similiarity.Not at all.Also I apply some Molycote on throttle barrel as precaution.Never got any sticky move until I run it on bench and after some full throttle application following after minor throttling excersizes.Never sticky before but after full throttling.Immediately gone after stops everytime.I dont think it will be a problem on a plane but must be careful sure.
BTW I placed an order for a SK .50 ABC BB. engine today.I hope I can report on it too.I have a trainer for it.