Don't bother, get yourself ACS Crossfire freewheel.
You need a bearing puller to get current one off with it's bushing to gearbox shaft. Getting freewheel off the bushing is trickier but you'd need to do it any case.
No suspension, high tire pressure and heavy bike (about 35kg: 15kg bicycle, 5kg motor+controller, 15kg battery). Oh, and high speed and bad roads.
I thought we were talking about stock ("new style") cyclone mounts.