I have a 81 GL1100 i bought a month ago. I brought it into the dealer to check it over. They said everything was good. The only thing was that the coolant overflow needed coolant. They added coolant. After I got the bike home coolant started coming out of the overflow tube. I thought maybe they over filled it. Well I rode for about 30 minutes today and the same thing. It stopped leaking when i turned the bike off. The engine stayed at the normal to cool operating temp. What would cause the coolant to come out the overflow??