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Deleted member 4366
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Don't take your motor apart unless you have to. Maybe at 20,000 miles give it a re-grease. Some come apart easily - normally those with screws in the side. Those with scre-on sides can be a bit tricky unless you have the correct tools. The Q100 and Q128 aren't to bad to bodge, but the Bafangs with the dogs/slots are very difficult. The one in OP's first post apears to have two holes for which a special tool is needed to unscrew the side. There's no saying how difficult it is until tried.
That controllet should be OK at 48v.
That controllet should be OK at 48v.