for the RMZ you gotta drain the antifreeze to change teh oil. PAIN IN TEH A$$. I would say get teh YZ250F. The CRF is for people that are more towards a 125 rider. There is basically no bottom end compared to the YZF, and the YZF hits harder everywhere. Despite being a little heavier (.5 pounds) and having a higher COG, the YZF is definately faster. If you like a nimble bike get teh homnda, if you wanna go fast eget the YZF.