Athena scooter parts as a whole are the most forgiving of all kits that I have come across since 2003.
With much success with Athena 70cc cylinder kits for air cooled minarelli scooter engines. It sonly makes sense to install and offer the Liquid Cooled 70cc BBK.
Either as an upgrade to LC Zuma or Aprilia and some Malaguti scooters Athena will get the job done.
For those who really want an upgrade that will last and get the most out of scooters would be to make in Liquid Cooled by adding the Athena 70cc BBK along with radiator, some hoses and electric water pump and slam the best scooter on the street.
Aprilia RS50 uses the LC Minarelli engine in some older models. This is the 70cc upgrade for RS50