Based on sales performance and also technical studies of the successor Yamaha Nouvo by Yamaha's R&D team, in 2003 Yamaha Motor has successfully developed and marketed Yamaha Mio in Southeast Asia countries and on March 2004, Hong Leong Yamaha (HLY) has introduced this model in Malaysia and rename it as Yamaha Ego.
2006 brought ome new changes to the Mio, particularly the name has been revamped and since then it known as Yamaha Mio Soul (except for Malaysian market).
Physical change also can be seen in this 2006 model spec, this includes an aggressive facelift by Yamaha team, it features newly design V-shape headlight for better vision range at night and newly body stripes design but the engine specification is still remain the same with 2003 model spec. For safety concern, the taillight also has been re-design with the addition of a retroreflector device.
For Malaysian market, HLY again has taken the responsibility to rename this new model as Yamaha Ego S (S for Sport) and also launch it in October 2007. The launch ceremony has taken place at the Sheraton Subang Hotel in Kuala Lumpur, Malaysia.