Here you go - Posted this before when others have asked about a similar noise , and they've found the same wear - try a search for camshaft wear.
I've also had three other bikes in the workshop since with the same wear
The strange thing is the cams on other side of the engine have been perfect.
Knocking noise from the R/H side - R1100 50K miles.
Cause = Worn cams, cam followers, cam/rocker holder and rocker arms.
The cylinder head after all the rocker gear and camshaft has been removed
Cam and cam followers.
Cam followers in the holder.
New cams and followers