Went back out to the garage and found out a way to reclock the horn on the barrel reliably without set screw removal. It was a bit difficult but the new position solved the problems. Why Saito doesn't allow for clocking of this item is beyond me. It is a simple fix for many linkage situations and should be a standard adjustment on all engines. Oh well. I have to say that after break-in today, this is my only complaint with this engine. It runs very sweet. Can't wait to fly it.