Yes i run mine up, mostly just on the first start of the day. Start it , idle for a while to get it warm first then open it to WOT. not prolonged periodsjust a check - a couple of reasons, i like to know it is properly warmed up and that full throttle is - well - full throttle.I am not worried about settings, rather about checking that the fuel supply is as it should be. I would far rather hear myengine sag while on the ground, than find that out in the air. And again its not settings for me that will make it sag. If you have somehow developed a leak somewhere or the carb is slighlty blocked with dirtetc etc etc the engine will lean out. listen for it on the ground and action can be taken before the engine finds out the hard way.

For me its simple - set needles and fly, the minute i get sagging or leaning - something has gone wrong and its time to strip and do some checks......