After the other day I have decided to flush my cooling system. I bought some prestone stuff good for aluminum engines and ran straight water through first. Now, my bleed screw is almost stripped, so rather than take the chance I just ran the bike with the radiator cap off. I got quite a few bubbles and when I revved the bike the water would shoot right out the cap hole. Is this normal, or I am thinking I know why I have a hot running bike as I am suspecting a head gasket leak now.