when you take a hammer and beat the dents out of it from crashing too much? What they are talking about is that a two stroke engine makes SHIT for power on the bottom end, when you get the revs goin' it comes into its power band, which is usually pretty narrow and modified through the exhaust pipes, it "hits", you just hear the engine pick up revs very quickly and it start laying down its HP. Honestly if you are trail riding and farting around the woods FUCK the 2 stroke, dead serious man, a 4 stroke has WAY MORE RIDEABILITY especially in the woods and for farting around...Do you REALLY wanna be slipping the clutch every corner to get the power down? If not then say NO to the two strokers, I kid you not, if you buy a two stroke and then ride someones 4 stroke bike, no matter what size, youll be asking yourself where the hell the torque went to on your two stroker. I had an '02 CR250 and rode my buddies YZ250F which is technically in the same class as the CR125 and I shit you not, at croom, that fucking 250F was WAAAY more fun, it NEVER bogged in the sand and there was instant power when you cracked the throttle. The CR required a lot of clutch work to lay down power coming out of a corner and it spends most of its time clawing for traction and required much attention to trying to maintain as much momentum as possible. t

PS:once again, theres a REASON factory teams run 4 strokes WAY more controllable and has usable power DOWN LOW where its needed in trail riding and tight courses.