[Barnsnake]

I have to invent things to "Tinker" with on my car. Since it's initial shakedown period, it has just fired-up and run. Admittedly, it's not very radical and I don't take it to the track. I do make changes, but not because they're needed, just because I like to "tinker". That's why I built it in the first place.

If you have a super-radical cam and a giant chokeless mechanical secondary carb, you can spend the rest of your life chasing some almost imperceptible flat spot between 2324 and 2332 rpm on days when the temperature is 41.7-42.5 degrees and the road is slightly downhill. That's a choice, not a requirement.

In short, once sorted, you can work on them as much or as little as you like. Breakdowns aren't really very frequent, but they do make attention grabbing threads on this forum. I expect the significant majority keep the dust off their tools with periodic maintenance and "improvements".