Suspension especially on a ktm is very important. I don't fill up completely on a short ride. I have handled the exc and xc-w and they are not as heavy. If a 525 exc feels lighter than than my 250sx, than there is a problem. I just find it weird that my bike is so heavy. Our enduros are usually 10 loops of 10km, with a chance to go to the pit every 1 loop. so i can manage with a standard tank, but i am going to change my tank anyway one day to an transparent tank. I still wonder if it is not my tank, what makes my bike so heavy? Does anyone have any suggestion on why my bike feels so heavy? I must admit i have not weighed my bike, but that will come later. sorry for my grammar and spelling, i have had a lot of beer's just before i wrote this response.