if you want more power id just stick a whole new pipe on their i have an fmf pipe on my ttr let alone i dont ride it at all anymore and havent but its whatever you feel more comfturble with ttr is a good lil bike and itll take u anywhere u want to go. if you already have a pipe on it try to do some other mods to make it snappier and if not that then go for a cr150 pretty much same size bike ;ighter than the 125 hell of a lot snappier its a 4stroke but is quick asap like a 2stroke