help with engines

Recently I bought a 2009 RXT IS from a guy on craigslist. ski had 63 hours and 7 years old. ski had about 2 or 3 light abrasions on the hull, not scratches, and you could tell it was beached a few times in it's lifetime (bottom of hull wasn't glossy, more of a smooth matte color amd texture)...

I just purchased a 2003 GTI RFI with 134 hours in great shape. When I got it home I tried to start it but it just clunked. Pulled the spark plugs only to have a volcano of brown fluid????? Tried to clean plugs and refire only to have it hydro lock again. It seems to be emitting less fluid but...

i have a 1997 speedster, it was towed in (after running out of gas at the hands of a friend) without pinching off the the water cooling intake lines(?) as i was told u have to do. or the engines somehow got salt water in them.:( it was never flushed and has sat for approx 3 1/2 months. now i...