At last it has been "estrenada".
Very light. Its perfect for narrow trails. Not bad on wide tracks. I'm 1.84m tall and the bike fells ok when you sit. Huge tank gas. Bad "ostia", definitely is a 2-stroke. Maybe trial gear-box is a bit uncomfortable (The gap between 4th and 5th gear is huge).
A stupid video of the first ride http://www.youtube.com/watch?v=tlVTRJK7MjE