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My mechanic found the right pinion gear in green bike kit.com...
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It's the pinion gear. it looks bad. I should replace the large gear too though it is only a little worn.
thanks for your reply.
I am...
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I removed the chain and used the throttle in order to show the problem.
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I have an old BBS02 750w labeled 8Fun that I bought used. I think it's likely a 2018 model. It's on an Xtracycle cargo bike/long tail...
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