Freewheel not freewheeling . Or it could be motor running all the time.. I went out out this morning got a mile started spinning round. Turns out wheel not tightened goosed hub and freehub. It was not freewheeling when I went out pedals turning all the time. Put on old wheel when I tighten the cassette just spins round . Can't decide if motor . But motor off same so has to be freehub yes or am I speaking rubbish.