The original kit 78001 was motorized, but it was reissued almost immediately and thereafter non- motorized. To motorized it you'll need the whole setup, gear box, motor, battery contacts.
Those prop shafts look aftermarket(?). Did you buy it on eBay?
It's been reboxed a lot, with a $$$ jack each time, but it's the same old kit.
Lots of good PE around for it.