Im new to outboard motors and this is the first one I have ever used one. While I was out in the water with my aluminum boat, I started the motor. It ran for about 1 minute and there was a lot of white smoke comming out. After that the motor just stoped working. I tried coutless times to start start it again but it would not run. This is a 1976 ted williams 7hp motor. Any ideas of what could be the problem? Thanks.