Actually, the "valve recession" is indeed the deformation of the valves due to excess heating (the OEM valves seats didn't transfer heat out of the valve well enough).
The fix/solution is to indeed replace the seats, and if deformation has occurred, to replace the valves and usually valve guides as well. Many of us just ride our bikes
and watch for signs of this to occur before we decide to pull the heads and get the job done - you may get lucky and ride for many, many seasons before this ever gets to
be an issue on your bike.
AT one point it was thought that leaded fuel would mitigate the problem, but I don't believe that is the case. Still, if it makes you feel better you can usually find
lead additive at many "gearhead" automotive shops where there are guys hanging out with older street rods, etc. I used to put in a dose of the stuff every other
tank of fuel or so, but haven't been doing so anymore. One key thing that will indeed help fend off valve deformation is to try to run your engine's combustion chamber
as "cool" as possible - this means do NOT run the engine too lean. Of course, running too rich poses issues too, just don't go crazy in either direction (lean or rich fuel mixture)
and you'll be maximizing the life you get out of your existing valves&seats. Check your valve clearance every 3000 - 5000 miles, and record the measurement you observe
each time. IF you observe any significant change (closing up) of the clearances from one check to the next then start checking more frequently, and let us know - we can tell
you things to look for as posted in earlier threads.
