24v conversion - pedals spin under power?

[Theojw71]

Hi, when I run my C5 under power, the pedals spin freely and increase in speed. I've fitted a 24v conversion and I didn't notice this phenomenon before; I'm aware it's probably the centrifugal force generated from the axle and the flywheel on the chain, and with my feet on the pedals they stop spinning, but I can foresee clocking my ankle sometime if I don't put my feet on them.

Anyone else come across this, and how did you deal with it? Any tips welcome.