Right, my mistake, the KLX has 16 and 19ers, but still is a small bike. I was thinking of the D-Tracker 125/150. I'm more into SM!
As far as I know Kawasaki built a 144cc off-road only with a carb first, called it the
KLX140. Then updated the 125cc engine to FI and offered it in an enduro, the
KLX125, which was a bit pricey. They kept the 144cc engine for off-road. Then they offered the carbed 144cc as the
KLX150 enduro for less than the 125. - Hope I didn't confuse myself!
So it's not really an upgrade, all they did was take the existing 144cc carbed engine and put it into a street-legal frame.
I mentioned the CBR150R because it has a much better engine and only costs a bit more; my way of saying that the little KLX is a bit overpriced.