Over heating usually occurs when your water radiator is some how clogged. Avoid cleaning it if its old, just replace it. If your radiator is also giving bubbles while heating then your engine combustion chamber (Head Gasket) needs to be changed and you are in big trouble now. Just change it and every thing will be fine.
If all above thing seems to be fine then check your timing. make sure its not over advance.
Regards.
Salman.
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