Bottom bracket jumping?

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4/22/2020 2:59 PM

So I replaced the bottom bracket on my bike, along with new cranks (BB came with cranks), and now I took it on a test ride, and every time I put pressure on a crank, it jumps forward?

Not a clue what to do now?


I've taken most of it apart and reassembled but it still does it?

Any ideas?


Cheers

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Plymouth, England.