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First make sure it is bled properly and that it stays bled properly. The bleeding process begins from scratch every time you open up the system. If that does not get it to run cool, make sure the timing is not advanced way beyond specs. Once you get to the point where those two potential issues are corrected, assuming they need correction, then have the coolant tested for head gasket leakage combustion by products.
If you see bubbles in the coolant after it has been bled then suspect the head gasket.
This is why you bleed it repeatedly. If you bleed numerous times and still get bubbles in the coolant, my thinking is suspect the head gasket.
It's possible a restricted exhaust system could be a cause which can also be tested.
Plugged catalytic converter.
Didn't you buy this car from a forum member? Hard to believe the PO did not KNOW about this problem.
On the Suzuki GS 500 forum they are finding that improperly manufactured valve shims are disintegrating and that destroys the engine. The Chinese sell them cheap and now they are wrecking engines.
One of the almost infinite reasons why the cheapest part is rarely the best choice.
regards
mech
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