They are a nice bike and have been improved i have an 07. However vento has pulled out of the U.S.
You can still get parts. scrappydogscooters.com was very helpful
Here is a site for vento owners you can find help and some info here.
http://autos.groups.yahoo.com/group/Vento_V_Thunder/
Of course the people here will give all they can. VERY helpful and nice on this site.