Seadoo Jetski What Causes Overheating On A Seadoo Sporter? Or In A Jetski?

What causes overheating on a Seadoo Sporter? Or in a jetski? - seadoo jetski

I have to constantly provide a Sportster 1800 and overheat alarm ... What role will cause an overheating? I started the engine before we left, then warmer .... The engines are the same as most jetskiis.