I have a 1987 kawasaki 650sx and when i pull the plugs out the following day to check them there seems to be

Question

some water on the end of the plugs?

Answer 1

Water  or are they wet with maybe fuel?

If it is water you have a water cooling jacket leak,  If just wet with fuel the carb may need to be adjusted, your fuel is too rich.

Answer 2

It is condensation. The cooling passages are open to the combustion chambers via the exhaust system.

You need to change your shutdown procedures. When you pull it out of the water, make sure the front is a bit higher than the rear of the ski, then crank it and rev it about 3 or 4 times. Don't run any more than 5 to 10 seconds (15 by the book, but 5 to 10 is plenty). Then pull the black k**b on the big exhaust pipe and crank over again about 2 or 3 seconds. That should blow all the standing water out of the exhaust. This should also make the ski easier to start next time out.