I finally got this bike finished.
As I wanted to use the original nice chunky sheaf, it was a real pain getting the new wires through, but I eventually managed it.
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All cables fit inside the controller box...
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I also made a rubber seal to poke the wires through, which should limit the amount of water that can splash up into the controller box. View from underneath...
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All done...
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I am pretty pleased with how this turned out, in fact the bike rides better than my own!
I just need to align the rear speed sensor, make sure everything is clean and lubed and all screws/bolts are tight.