dh@. wrote in message ...
The last time I rode my Jet Ski it gave me a problem
with overheating. The cause is that there wasn't much
of a stream of water running through it to cool it. The
stream from the outlet hole was very inconsistent, and
looked like it might be clogged by something. I ran it
up on a beach too fast the day before, and was afraid
that might cause a problem. If that's what is likely to
have done it, and there is a way of cleaning out whatever
may be causing a clog, can anyone tell me how to do it?

You answered your own question. You need to clean the beach sand out of the
engine cooling passages. Get a maintenance manual for that model and it will
clearly describe the cooling system. Follow the path of the cooling water
in, disconnect the hoses, flush out the crud, reassemble.