93 seadoo no spark help

[tommac]

I have a 93 seadoo gts. When i first put it in the water it starts up fine and runs good but then after i have been riding it it dies and i dont get any spark. But if i leave it sit for awhile it will start back up and run for about 10 mins then die again and no spark. I replaced the coil and made sure everything was tight but still the same problem. Anyone have any ideas what the problem could be??? Thanks