Hi
I have a verucci apvispa 50cc 4 stroke.Excellent scoot out of the box.Top end is 45-48mph.But it was kind of a dog off a light or up a hill.I swapped out the 6 gram 13x16 rollers and put in 5 gram.It's a big improvement,nothing crazy but now i can climb a hill doing 30+ and i don't hold up traffic.I was able to keep up with the can in front of me earlier today.I just wanted to post this for anyone having the same issue.I also have a heavier clutch torque spring(yellow) i'm going to install to see if i can get a bit more bottom end.Hope this helps
