I own an 04 KX 250F and I just recently got the motor ported an polished. It did make a big difference and then I got on my buddys YZ 250F and it felt like the YZ had A LOT more power still. I ride mostly freestyle and motocross and the KXF just isn't cutting it jumping ramps out of tight corners and short runways but the YZ seems as if it wouldn't have a problem. I am seriously considering trading him my bike for his and some cash. What do you guys think that know about the 02 YZF's? Are there any problems or issues with them or are they pretty much bullet proof? Thanks.