Hello, My brother bought a 30-year-old Aprilia Red Rose classic 50. Supposedly 890km ….but it looks very comfortable. We have all the liquids renewed, battery and candle also new, carburettor cleaned and it also starts. But either it turns very high, takes forever to go down with the speed or goes out. On the first test drive she managed just 40km/h. In addition something is loud. Can someone tell me how I reasonably put the carburettor and whether the noise (from the gear drive/water pump/oil pump range) is normal…. Thank you very much