Jepp, the T is there.

 

What way is wrong msethhunter? With a post like that I can't with the best of my ability see that the right way ( the intended way) is anything else than the negative. So I guess that is the way I should take it, not?

I am looking at the chain as one of several possibilities, but from your answer I deduct that this is not a likely candidate (an explanation here would also be nice. The serious unknowledable might learn something).
Same go for the piston theory. What exactly cause the vibration?
The " it's the whole rotating assembly being far out of balance now." tells me nothing. What is out of balance and how? Surly someone with your mechanical experience can come up with some plausible explanation other than the "rotating assembly being far out of balance".
The engine has lived with these vibrations for a while now. It's more than 20 000km since I replaced that valve.
Today I was at the track and had another 30 laps with two long straights keeping the revs above 8000 for long periods. The badly damaged piston still work. I find that quite amazing and would love to find out how that's possible.

 

Ask yourself these few questions.

"Was the issue present before the valves hit the piston?"
"Does it get worse as RPM's increase?"

Sounds like you already know those answers.

If the answer to either of those two questions is "Yes," then tear the engine down and have a good look at the rotating assembly (pistons, crank, rods, etc.). If it's bad enough to cause you enough concern to pull the valve covers off and check things like cam timing, chain wear, etc., then it should be bad enough to quit riding the bike, and see what is wrong. If you are still riding it, it tells me a couple things. Either it isn't all that bad and you a feeling something that either isn't there and chasing your tail, the engine is on it's last leg and about to buy the farm, or, you lack the experince to tear into the engine and find out what is going on.

Have you done a leak down test? Have you checked BOTH sets of cams for proper timing? Have you really torn into the engine to see if there is an underlying issue at work? Have you checked to see if the keyway on the flywheel looks buggered up? What do the cam lobes look like? There are so many things to look at, I could keep going and going and going. There are so many things it could be, and you have checked the basics it seems, but also seem a little afraid to really dig into it to see what is causing the vibration. I have seen even small dents in pistons cause huge problems, up to the piston coming apart after a few thousand miles, and vibrations that are beyond what is considered "normal," even when they don't come apart. IMO, if the top of the piston doesn't look like it did when it came out of the factory, it should be replaced, save for some carbon deposits. Pull the tank off, the air box off, and start at the top. Work your way to the bottom of the oil pan and inspect everything. Seems to me, that if your cam chains aren't showing signs of wear (which this type of chain will stretch so minutely, it's almost not mesaureable), your compressions are normal, you need to start digging deaper into the engine.

Start with a leak down test. Just because compressions are normal, doesn't mean that the engine is healthy. You are going to have to dig deeper.

Like I said, I'm not trying to be a dick, but I also don't feel like writing a book for someone on here who's experince is at your level (not trying to slam you). If you really want to learn the bike, get a manual, tear into it, and learn it. Learning it over a few internet posts is going to end up either costing you a lot of time, a lot of money, or both for an issue like this. You have checked the basics. It's time to go beyond that and just do it, and report back with what you find, or have questions about. But, you need to tear it down. And like I said, if it's bad enough to cause you concern and start this process, stop riding it until you either find the issue, or give it a thumbs up and everything looks okay.