A lot of scooters use retrofitted 12v electric water pumps (reliability), bosch is the ones used:
https://www.google.se/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=bosch%2012v%20scooter%20pump
In regular scooter (non-electric pump) the water coolant is both for anti freeze and for lube to keep bearings etc good and prevents parts from rusting. Dont know if this is the case here. The rust part perhaps, at least. Go for it.