I'm looking at possibly buying a 400ex but need some advice first. the guy told me that it won't start but when he tries to start it it will turn over but leaks oil pretty bad. Does anyone know if that is just bad seals/rings or would it be from something bigger like a cracked head/cylinder and approx how much would that be to replace?
Any help is appreciated
Thank you

 

You have some good advice on another forum that you posted this same question on. You will find your answer there.