Well, I don't have specific familiarity with that engine but I'd suggest after over-heating so often it's going to require some detective work to make sure there is not other damage beyond whatever leak is likely to be causing the core issue. First off, I'd suggest (with proper gloves/burn protection) checking compression after it overheats.
There could be a leaky valve that leans out the fuel mix or even sticks when hot, there could be a crack somewhere that only opens when hot (head gasket, ring, cylinder, block, etc), warped head, could have a weak or cracked valve spring, could even have a clogged crankcase breather that causes pressure to build and lean out the engine. Stranger things have happened ..... (carefully) checking the compression cold and hot will at least eliminate or indicate whether one of these is possible.
__________________
I am Goof
|