I got another question on the same 3 port engine that is making the ting sound at tdc. When at tdc it also seems as if theres a groove. It will lock into tdc and won't move unless i rotate the flywheel. I put the engine on the starter box and it will move just fine unless its stuck at tdc which happens once i take the engine off the starter box. What i don't understand is the internals of the engine look brand new. The outside looks slightly used but the inside is very clean with he exception of the ting noise that only happens when the head cooling heatsink is attached. I'm not sure what i should do from this point or if i should just try firing it up and pray that it doesn't get damaged in the process.