Recently I spent almost as much money on "diagnosing" a Carby problem as purchasing an overhauled unit.
know that one from the inside. as a result I have a near new marvel schebler sitting on the shelf and know how to do a carby overhaul.
engine showed deteriorating grunt over a protracted time so have 4 new cylinders sitting beside me. turned out to be the magnetos going out of tune.
owning an aeroplane isnt for the feint hearted but I wouldn't miss it for the world.