The hub on our Mistral has broken (it is not the pawls) so that the pedals will no longer turn the hub. As the 36 volt battery, controller, etc are all in good order, and I happen to have a 250 watt Suzhou Bafang 24 volt motor to hand would it be safe to fit that in place of the existing 36 volt motor? In other words would the 24 volt motor be able to handle a fifty per cent increase in voltage?