Something is not right with your cooling system. A GL500 should never get burning hot. Start out by checking to see that coolant level is right to the top of the radiator. Don't check the plastic overflow tank but check it at the radiator by taking off the cap while cold. If fluid is up to the top, then perhaps the thermostat isn't opening as it should. My '81 GL500 had overheating issues and the problem was the impeller splines were completely ground out so it didn't turn properly. Got a new impeller from ebay for $20.Bike gets BURNING Hot to the air even..