By lifters do you mean pushrods?
I can see this turning out to be another good learning thread.
I am a noob learning about my R80GS & although I ask my friendly mechanic lots of questions, they unfortunately don't have a spare airhead handy to show what things should look like.
Is it possible for any of you experienced guys to post some pics of any bad looking lifters, valves, pistons, bores etc vs an used but still good condition ones? Pics are so much easier to comprehend than descriptions.