bought another 250x

[250xsupertrapp]

i just bought another 250x for 300 bucks, it has a brand new high comp weisco, stock bore, never ran, should i change the jetting, also the rockers are all chewed up, what would cause this to happen?

[Sjorge450R]

worn cam chain, bad or wrongly adjusted valves. The cam its self could also be bad.