Vento 250c motorcycle. C.2008

I request support to know the engine and box of my motorcycle Vento Barracuda Motor 250c.c. 2008 model. It cost me a lot of money and then I did not know that it was a brand of poor quality; now I need to repair it because the speeds were blocked and I only know cars, but I do not want to venture to repair it without technical data, greetings and thanks!