RE: New CRRC Pro GP50R prototype 50cc
If you have a prop drill jig you can use it to pull the prop hub, Take off the prop nut shaft and mount the prop jig with the long part facing the crank shaft, Use some short 5mm bolts and when you screw them down it will remove the hub. They are hard to get off but do not heat it or you might destroy the magnet.
I use a DA prop drill jig, It is center taped for 1/4-20 bolt.
Milton