Ok heres the deal.. 98 Sea Doo GS with the 717 in it. After getting them out for the summer cleaned it up pulled the plugs Hooked the hose up and turned it on by not thinking clearly but then i notice water slowly filling up in one of the cylinders but more in one than the other. Here is the background. These are a friend of mines that im getting ready to buy (hopefuly) he never winterized them so my first thought is cracked cylinder or head, tore the top end off tonight and can not find a crack at all and everything looks just fine.. Im clueless here... alot of money could go into rebuilding here but im not sure it is needed i have the motor open now with time ticking very fast.. Im thinking about replacing the top end seals and gaskets and trying again the reason why is because the seals were all their and intact but i couple i frowned apon more so the bottom gasket because it was slightly bubbled and had crrosion on top of the gasket where the water cooling portion of the cylinder sits.. Any ideas??