One thing that dealers have to contend with is even the aftermarket parts they might have to install on older bikes is that they have to warranty the repair including all the things they do to install repairs to the same standards as a newer bike.
I worked at a independent auto repair shop, after changing motor was told we did something wrong-it was making noise and it must have been us, They drove it till the rotor separated from the hub and still thought we did something wrong even though it was almost a year later. Of course, was threatened with law suit .
Story has nothing to do with motorcycle problems, but thought it was good story.
Just try to find mechanic at dealer auto shop that even knows how a carb works or what that round thing on top of engine with a wing nut holding it on. What is that round thing with the 6 or 8 wires coming out of it, and that thing inside it that opens and closes. WHAT? THAT NEEDS TO BE ADJUSTED...WITH FEELER GUAGES, AND WHAT IS A TIMING LIGHT.