Appo ,when I bought my orange bike it was in very poor condition but still was rideable the piston would knock something terrible untill it warmed up I am just giving you an Idea how things were when I got it.
Now it looked like to me the head had never been of it, I did replace the exaust valves only and new stem seals on all 4 valves.
My point is this bike is running with no problems because of other work I did to the motor the valve guides have never been replaced and it has done 142k
If you can feel play in the valve there probably stuffed.
I ride alone and not a KTM in sight .
Menace Racing supported by Robmoto Industries