Okay, So I've decided to bite the bullet, and refresh the heads on my 100k old '04 950. I know the valve stem seals need replacing. But I plan to have the valves lapped, cylinder re-honed, replace the cam chains, tension rails, rings, head gaskets and anything else that's sensible while I'm down there. I've never done something this big before. I plan to follow the workshop manual, which I have, and any relevant bits from the HoW and ktm950.info. But could anyone else who's done this job possibly offer some advice? What exactly IS 'valve lapping', and how do I do it? Give it to a shop? Same for cylinder honing? How exactly do I replace piston rings? Is there a special procedure? Or just take the old ones off, and put the new ones on? What else should I do/replace while I'm down there? Any other tips or gotchas I should be aware of? Cheers.