Hi I am new to this site and I am looking for some advice. I have a 91 sp and it has 140 compression on both cylinders, I will put it in the water and it starts no problem run it for a while, use the stop button to stop it and then it won't re-start. This has happened twice, so I take it out of the water and change the spark plugs and it starts again? When I am trying to start it it doesn't keep trying to turn over it just try tries to start for a brief second and then sounds like something is spinning. So many thoughts go through my head about this and I need advice? Why does the starter not keep trying to start? And what else could be the issue? When it does start it runs amazing, so choked I am sitting on my deck with two broken doo's in the water in front of me. Any advice would be great thanks in advance