I know this isn't a quad question but I figured some of you may know so I'll ask anyways. So I got this Suzuki rm250 dirt bike and the guy I got it from is saying that it needs a bottom end rebuild because the crankshaft turns over real hard by hand when the top end is off. he didn't say anything about if the rod moved or anything this is all he said. I haven't got it yet but what do you guys think might be wrong, appreciate it.