This thesis presents the model validation of a go-kart chassis frame, made through numerical and experimental modal analysis of a complete kart vehicle. Conducted in collaboration with Autoeuropeo Motorsport karting team, the Tony kart Racer 401 RR direct drive model year 2024 is taken under investigation with the aim of figure out the vibrational modes with the corresponding frequencies of the chassis and relative fundamental components. Moreover, a model updating is performed by hand with the purpose of reducing the percentage of error between experimental modal analysis (EMA) carried out by means of LMS-SCDAS software and finite element analysis (FEA) made with LUPOS (by MATLAB software), to spot the right material properties of the analysed components as well.