hard to tell with no pics...but I did a search and found 2 Kymco Espressos for sale on bikesales.com.au. 2006 and 2008 models, both 150s. Does this look like your scoot? I also found a 2009 online and it also said it was a 150. I would think it unlikely that a manufacturer would sell both a 125 and 150cc of the same model, side by side. Can you post a pic?
