Hi there I've been riding bikes for a few yrs now. And have just upgraded the miss's from a 125cc quad to an Atomik nitrous 140cc midsize (bad choice as she is a very petite girl) and this will be her 1st bike. It is a little bigger than I expected and has plenty more power that I thought it would is there a way to reduce the power to say 50 or 60% or the top speed down to about the same. I've heard of restricting the butterfly in the carbi or making it so the accelerator can only be pulled back to about 50% . Please someone help I'm dying to go away riding but need to get her bike safe for her to ride before I do.