That's the thing though, Dave. I know my bikes are always in proper riding order, just as I'm sure you know your bike's to be also. But we don't know what condition everyone else's bikes are in when they start asking questions on here.
We don't know the last time they had a valve adjustment, what type of gas they use, how hard they ride the bike, how often they change the oil, or if they even know what a carb synch is.
If their bike has never been synched, sat all winter with gas in the carbs, plus one of the floats got stuck and flooded out one of the cylinders, killing a spark plug, then they started riding it for several weeks running on three cylinders before they asked us questions, then they have more carbon build up on one cylinder.
Or better yet, they just bought a bike from someone who had all that stuff happen, and now they are trying to get it back into tip-top shape.
Regardless, lets say they fix the float, change the spark plugs, and synch the carbs, and it runs 90% better, the more they ride the bike, and the carbon in the cylinders and on the intake valve gets burned off, it will throw the carb synch, because everything NOW has returned to normal. So now you go and re-synch it, and now its at 100%.
These are machines, and everyone treats theirs differently than everyone else. You might never need to re-synch your carbs, but someone else might. Everyone's different.
A carb synch won't hurt anyone, and they don't always come perfect from the factory. Just like the idle speed screws aren't always set the same amount of turns out on all the carbs.
A bike that's working properly and well maintaned won't need work as often as a bike that gets neglected. And this is the time of year everyone brings their bikes out of storage, and issues come up. Maybe their battery is on its last legs, maybe one of their carbs is gummed up... Who knows.
All I know is there's a lot of things that can put a bike out of proper working order, and its better to start small and work your way up than to just throw money on go fast parts, and hope they help fix things up.
BC.
I didn't do it, I swear.
And even if I did, what makes you think I would admit it to you?