hi flecc,
after a bit of advice please,
i have an old cyclamatic powerplus it cuts out when under load (going up hill) switch off the key and on again and it all works then and cuts out again, no issue at all on flat
i think the controller is duff as the battery is fine,
any idea what controller i would need to buy to replace it and from where?
currently saving to buy a newer bike but.........
Make sure the locknut is tight on the frame part...that can make a difference.
To fully resolve it, i put some thin (2mm) felt sticky pads inside the frame to stop any movement. Not very techie, but it works well.