hiha hat geschrieben:I know: They did it that way, to minimize vibrations in footpegs and handlebars.
This is the point for sure, but when I said "mystery" I meant designed balance factor in factory. This 68% value for junak comes from factory paper, because there are available fortunately. If you took oryginal crank and measure it, you will have result for example from 40% to 80% becouse of wide tolerence... That's the point. Research must be done about who worked there at the time, still lives and could still remember that. All engineers could not be dead till now...
In junak for example as far I as know the history of it, they made a crank with changeable balance factor. They could made a difference just by taking a cylinder with head off. And they do a lot of experiments and pick up 68% value that way. That's the value that gives best feeling for a rider. Of course in practice it wasn't that great becouse manufactured cranks were poor quality and the real value was way off this 68% sometimes but the research was done and when you balance your crank or make new with this 68%, you will have a result in smoothest possible engine feeling in junak's frame.. I'm pretty sure they did it that way in MZ factory, and the best value, in the opinion of an engine designer was picked. This value is a key here