Well if it won't go any faster from 1/2 to full throttle then i don't think lots of mods will help that, now you say it's a 150 eh?, is that a GY6 type setup with the CVT?, i wonder if the clutching (primary/secondary) is not working properly and therefore not allowing you to go any faster, i'm not sure, but do these have a speed limiting govener on them?
|