I've got a clarke wood working lathe that runs really really slowly. Maybe 10 revs per minute instead of the 500rpm the lowest speed should be.
Its got a 370w brushless motor the size of a beetle starter motor and a massive capacitor on the side but other than that theres not much to it, just an on of switch. The speed is adjusted by adjusting the position of the drive belt a bit like on an old DAF cvt transmission.
I'm not really sure where to look or what to test.
I assume the capacitor is used to start it but does it also need it to continue running?
It looks like the capacitor is only available as part of the motor assembly for £160+ from clarkes parts department if its at fault.
Its the same model as this: