What is wrong with a dirt bike if it wont shift?

well there can be many things.Maybe your clutch cable is badd it needs to be tightened or ur clutch could be goin out.But it will be prob around anywhere based on parts form 100 to 300 or more possibly take it to ur closest mechanics shop and theyll check it out ive had this problem and it might still be rideable u just have to keep on notchin it up there or down there.But it can be many things.