Das Problem scheint zu sein, ein Encoder-Material zu finden, was lange haelt. Habe im US Forum schon mal nachgefragt, da gibt es einem der die Schleifer"haare" etwas verstellt und diesen Service anbietet, er hat auch Nachforschungen angestellt, aber keinen Lieferanten gefunden, hier der Text:
Shogun, it's the main problem with these DK motors, anyone can clean them up but that does not help when the feedback from the open encoder is wrong.
My approach is to move the encoder whiskers fraction of the mm at a time so they hit unused encoder surface then re test each time to see if the fluctuation was reduced till they are close to factory spec as possible.
It's a precise and time consuming procedure to say the least but it works.
That said throttles can be rebuilt this way only once, no replacement surface material works, I tried several, it's not hard enough and wears fast. I have commissioned an encoder manufacturer in the past to reverse engineer this open encoder design with the Bosch spec sheet you have in your post, after much back and forth it was not worth doing financially.
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