Hey guys i exploded the motor in my 2012 crf250 last weekend and pretty much everything is destroyed, cases, cylinder, crank, some trans parts, valves, head, etc. So basicly right now im in the market for a replacement motor. My question is what year motors will work with my bike, im guessing anything from 2010 to 2013 would work. Are there major changes from 2010 to 2013 in the motor that i should know about? It is going to be built into a mod motor so I'm not really concerned about different cams or porting etc since that will be taken care of anyway. Let me know what you guys think, Thanks!