[93ts]

I have a 93 tandem sport that ran great until something got stuck in the water pick up and got hot and stopped. Cleaned out the pick up and ran good for a while then when I go to use it again it wont start. Check the plugs and no spark. Bring it home, put it on the hose and it runs all day if I want it to. Go to the lake, runs great until I get back to shore and try to restart it, won't start. Check the plug, no spark again. Any Help?