well... its not chain soo I guess there is no sprocket changes you can do! there is NERFS, handle bars, tires,axle,a-arms thats pretty much it?
+ the performance. But the 250ex is a dated platform and the weakest in its class (not to rag, but the truth), (Yamaha Blaster, Suzuki Z250, BRP 200) but it is a HONDA!!!!!! = last forever.