if it was over heating before and it isnt now than thats weird but if it didnt overheat bfor then it could just be your spark plugs or maybe the seals leaking and oil was dripping into the cylinder and thats pretty easy to fix with some new seals and if your like me and dont trust it get some high temp (black the orange makes a mess) RTV or gasket maker but make sure you do it quick cuz if the rtv sets up before you have it in place it will leak even worse