I wouldnt worry about it to tell you the truth as new chain for the whole kart will only cost you like 10 bucks max. Should be around 2-3 bucks a foot. If u really wanna save it get some old engine oil, boil it up in a tin can and soak the chain in there. Let it boil for a good half hour then let it cool down and just leave it in there for a day or two. The oil will penetrate the chain and work its way into all the little links n stuff. Should make it usable again.