flush engine

Hey everybody, new to this forum. I have a 1996 Seadoo GTS and I'm wondering if anyone has any suggestions on how to flush this. From what I can see there's no pre installed flush ports on the watercraft so I bought a aftermarket flush kit that installs inline on a water line. That's fine and...

I have a 2011 260 rxpx son had it riva exhaust hose (installed by previous owner) came apart poor install. But the ski sank flushed ski with in minutes. But i cannot figure out how water got in the oil? I thought the oil system was sealed? The intercooler was completely full of water flushed...