168cc tops at 49 mph

[YouFirst]

I just got a new Tank 200 (168.9cc) and the rpm is HARD limit at 6500 with speed ranging from 45 to 48 mph.

I bought a new 49cc for a friend and his can go 38 gpsv. I feel a 168 should be a bigger difference than that. I was hoping to use on state routes where speed is 55... And not hold up traffic.

Should I start by changing to a cdi with higher rev limit? Is it possible they have a speed restrictor ring like the 50cc? I'm going to end up needing a gear kit aren't I 😭