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The new chain jumps on the sprocket, it goes very fast and I can really see where it happens, but think it does not jump to an other sprocket but somehow on the spocket itself. It only occurs when I pedal with a lot of power and only on the smaller sized sprocket.

Edit: Image of Missing Link and sprocket.

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    Spoke and sprocket are different things. Chain should not touch spokes. Spockets are not a thing. That being said, if you didn't replace the cassette, it's probably worn out and needs replacing too.
    – ojs
    Commented Apr 29, 2017 at 9:43
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    See this answer why mixing new and worn-out parts (new chain/old cassette, new cassette/old chain) lead to a jumping chain.
    – Christian Lindig
    Commented Apr 29, 2017 at 9:48
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    @Paparazzi that suggested dupe is about the cassette rotating on the splines of the freehub. Penta probably needs to change cassette as well as chain, and ASAP else the new chain will wear much faster.
    – Criggie ♦
    Commented Apr 29, 2017 at 12:22
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    @Batman: Stiff links are common when the fresh rivet binds. But since this is a KMC assembled with a 'missing link' it seems rather unlikely.
    – Carel
    Commented Apr 29, 2017 at 20:12
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    The cassette does not look like it is worn-out. But please correct me if I am wrong.
    – Penta
    Commented Apr 30, 2017 at 10:48

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