Sorry but I do not know the german name for this part so I have added a picture.

My engine makes a knocking noise when riding. It does not make the noise when the engine running but not being ridden.

I have pulled most of the engine apart and have found the weight "A" is a loose fit on the shaft "B".

Does anyone know if this is a problem or if all the Estrella's are like this?

http://i274.photobucket.com/albums/jj254...zpsurp0rdpc.jpg

Did you cure the noise, was it the balancer shaft?
mine has a similar noise