Hi Kevin,
Yes, just fit a fully charged battery in the carrier, connect one side to earth. Take a lead with a switch in it and connect the other side of the battery to the coil (polarity is not important providing you have no other electrics connected). You should now be able to switch on and start the bike. Only when you have the generator in circuit will you need to make sure the polarity is correct. If the generator is fitted in the timing cover and the wiring disconnected, make sure the generator wires cannot touch each other or earth out
Regards,
Eddie.