yeah, i went from the Rm125 to the YZ250F.. You really dont notice the change of weight, especially when you are twisting the throttle on straights and hills, its a blast.....when you slow down a bit in turns, you may notice it if you like the light 125, or when you wreck on a hill... but you will get used to it.. its not that significant like this heavy beast...it's a bike of its own. I love it. Now if my ACL reconstruction would just miracuously heal and I could ride, it would be even better.....