i know that yasuni is an exhaust
but the schooter on the vid he ridso n is Aerox ^^
btw yo ucan see this vid?
http://davina92.hyves.nl/album/15542852/Vrienden/MsO9WAZI/video/1038648829/0/rJWe/?ga_campaign=photoItemEntry_PhotoBox_Profile_Photo#media_navigator_1=1&media=1.1038648829.rJWe&__state__=11
my friends Aerox.. goes 137km/h, 70cc, stage6, etc, etc, etc