I think you may have a water link from your cooling lines. You should
bet very little water in the bilge unless you do subs, or have to
rolled over. The siphon lines should not take on water, especially
when the engine is running.
Your engine should not be getting hot enough to steam, except for out
of the exhaust.
If you have a trailer secure the ski to the trailer, back into the
water, and run it at half throttle or so. If there is a cooling line
leak you should see it. >> Stay informed about: kawa 400 bilge