Hi all, I have a 2013 FX SHO with only 160hrs. I noticed some salt buildup on the exhaust manifold gasket for several months. now the ski wont turn over as if its seized. I pulled the plugs and found that the 3rd cylinder has some rust on the plug. I'm thinking it leaked through the water jacket. If so would it have only gone in the combustion chamber? How bad would this be? There isnt a single shop on big island that will work on waverunners. ill need to do this myself. ive pulled and engine and replaced it with a remanufactured in another ski before, i can handle some minor engine work. any help would be greatly appreciated.