Mine had no balance marks, came form a bike with unknown history. I remove tons of rust which left quite some pitting. Slap it together, don't waste your money on clutch balancing. I did it on none of my past and current bikes and none of them was particularly vibrant.
Some of the above is fact, some is fiction, some is my personal imagination and some is just simple truth. [me]
... i'm not touring around the world, but neither are most of the guys i see running overloaded spam cans ... [bmwblake]
'72 R75/5 The Blues