I would check them! Even with the new oil, you don't really know till you look! I put 400 miles on mine with the old apv oil, and they were real carboned up. Get some carbon cleaner, I have also heard the Oven Cleaner helps in removing the carbon. I just use a razor blade and emory paper to remove the carbon along with the carbon cleaner. A little messy, but works.
This is not too difficult.
First start off by removing the cover for the servo motor, just loosen the bolts, and it slides out.
Next take off the retainer clip for the cables. (Be care full not to drop it).
Rotate the servo motor and remove the cables from the servo, and detach them from the whole assembly.
Next is to remove the APV covers. I would suggest doing one at a time.
Then remove the three hex screws and the valves should pull right out. If they are gummed or carboned up, you may have too give it a good pull. Don’t Drop them, they are hard to get if they fall in the belly (I found out the hard way).
These valves only go together one way, take a good look at the assembly, and take notes. If you put them back together wrong, they won’t fit in.
Also be sure to tighten up your exhaust bolts. Mine came loose and carbon gunk started leaking out of my exhaust, thus causing a vibration at 5500 rpm, and caused one of my valves to stick in the close position (due to the excess carbon gunk).
newf