My first new motorcycle was a 1976 Kawasaki KZ900. I'd done plenty of work on my previous bikes, including rebuilding a few engines, but I was encouraged to have the dealer perform the initial maintenance for 'warranty purposes'. As I remember it was at 600 miles/1,000 km and included an oil change, check of various components, and a basic tune up.

When I got it back it wasn't running as well as before, so I took it home and checked it over. They had attempted to adjust the ignition timing. Those old bikes had two sets of ignition points (one for each pair of cylinders) mounted to a plate, and timing was adjusted by moving the plate. Timing was way off, but easy to fix, so I set it and all ran fine.

I've owned 9 bikes since then, riding them over 600,000 miles. But that was my first and last trip to a dealer for the initial maintenance.