My son - 13, 130 pounds, 5.5 tall - has outgrown his yz80. My dilema is should I get him a 125 (used) or give him my 93 yz250? I know the seat heights are about the same but the weight difference is at least 20 pounds. A 125 has to be ridden more on the pipe where my bike is easy to ride at slower speeds. We just play ride, some track and some trails. I dont think the power difference is an issue but the size difference and ease of use has me concerned. What would you do? Thanks.