Good evening, after more than 20 years I bought a scooter again, so far so good, I bought an older one extra so that it runs a little faster, what one reads so run the sv50 ö about 65kmh, my ran at the beginning 47kmh, now runs jer with new weight of dr. pully 55kmh, would like to crack the 60, can someone give me tips? Ahja got a universal exhaust off whether that can be due to it? Thanks and greetings