Good evening. I would like someone to tell me how I can pull out the dynamo to change the timing chain. If you could send some photos or sketches will appreciate. The motorcycle is my one R26 1957.
Do need a special tool? Since I read and I could understand, this is done using the bolt is screwed into the shaft and keeps the whole system. Is this true and if so how can I handle it?
Thank you very much!

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This book:
http://www.snafu.org/restore/uandm_bmw_v1.pdf
describes how to remove the rotor on a /2 generator. The /2 as far as I've come to know represents the twins cylinder bikes from '55 to '69. But your R26 is a '57, so I'm pretty sure that it contains the same components in terms of the generator.
Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2