I just got off both bikes. You are right, the 125 is faster than the 300, pretty significantly. The real test will be this weekend. Gotta see if the KLX can get me up this one hill, I've tried it at least 10 times with my 125, never can get quite to the top, I always have to side hill for the last few feet. If It takes me there I'll be sold. Weight wise the differance is pretty minor. I can pick up both bikes by the swingarm, and thats all that really counts, I can drag the tire out of a rut. I'll keep this thread updated......How about a different spark arrestor than the stock one, the end caps hole on the KLX is about !/2 inch big, seems pretty restrictive, probably for torque. are thier aftermarket mufflers for the KLX?