In my case, my daily driver is my beloved 1994 Harley-Davidson Sportster.
So, I handed it over to Roberto, an H-D trained mechanic who quickly went to work and discovered, among other things:
- totally pulverised, almost non-existent valve oil-seals;
- crusty valves;
- fairly worn-out piston rings;
- discoloration on one of the cylinder liners;
- the oil tank AND the battery carrier about to break loose from the motorcycle (!);
- a faulty oil pressure warning switch, which - given the recent BSA debacle - I think we can all agree is a bad omen;
Now, I like to tinker with old bikes. I like to learn how to do "new" things and improve my skillset, and the Sportster is by far an easier machine to work on than, say, a 1950s Triumph. I have a Clymer workshop manual for the Sportster that's about as thick as three Encyclopedia Britannica tomes stacked together.
So why not fix this myself? I'm sure that given time I could learn how to do it... but that's exactly the point: it is one thing to play around with a bike that you realistically won't need right away. You can afford to take your time and keep it in the shed for a whole winter. But a daily driver needs to be ready, always. So it's better to rely on someone who really knows what they are doing and can get it done quicker than you can, so you can get maximum reliability out of something you use so often, it is practically an extension of your butt.