From what I've read, the xt125 is VERY under powered - 10 bhp if memory serves.If your mate wants a machine with max legal power for a 125, get a WR125X. A bit more ���, but 50% more oomph. The xt125 shares almost no components from the xt660, apart from maybe light bulbs, brake/clutch levers (I think), & a few fasteners.Do not be fooled by badges!!I had a WR250X - a great bike. Really light, flickable, but just not enough power, & needed an oil change every 3k miles. Am liking the new KTM LC4 690 Duke; hopefully they will update the 690 SMC accordingly shortly. Perhaps Yamaha will come up with something even better soon??