Rowdy, are you looking for low-end? A Rad Valve is more what a 125 needs, as it helps boost the top-range. When I purchased my cr125 it had a V-Force and it ran great. Gave it a little low. But nothing to speak of, anyway, ended up robbing alot of top-end power. So, I replaced it with a rad valve. Couldn't be more happy. Much much more power in the top-range. Lost a little low, but it's a 125. I'd recommend a 250 if you are looking for a bike to grunt around on.