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This is often caused by an air leak , inlet manifolds, exhaust gaskets into the head or the gaskets between the headers and muffler.
This is assuming all the rest of the bike is set correctly, valve clearances,airfilter, clean carbs
it sounds like a head gasket has blowen out on you or its running very week on fule that would cause it to run hot but to boile up like you sead it did that bothers me a bit?
did you fit a new thermostat as soon as you found out it was over heating? if you have cooked the engine you may have damaged the pistom rings as well,, get a compreshion test done on it to find out,
dont ride the bike till you have sorted it out
DRAIN CARBS FROM PETCOCK AT BOTTOM OF EACH CARB MAKE SURE FUEL DRAINS COMPLETELY THEN TURN FUEL BACK ON, IF THIS IS AN INJECTED MODEL DRAIN TANK AND FLUSH THEN RUN IT HARD FOR 20 MILES OR SO, MAKE SURE YOUR OIL LEVEL IS OK
todays bikes run perfect on Regular, which can be from 87 to 90 in some cases. you would not damage the bike by using pump gas like super or premium but anything higher may cause problems. but there is no advantage to using premium
sounds like a dirty carb or faulty spark plugs, run some sea foam cleaner, I done it before helped my bike specially after a long winter sitting, PLEASE LOOK AT THE LABEL AN FOLLOW THE INSTRUCTIONS ON THE CAN...you may find seafoam cleaner at a speedway gas station or autoparts.