im a boat nut too, (my parents had a big wellcraft, I have a '05 seadoo fast devil) my advice is the same as marty's marine stuff, a lot of people tend to just put normal car and truck parts in the engine, well water gets in there a tad bit no matter what, so the next thing you are blowing your alt, starter, carb and anything else. just slowly and make sure you use all marine parts, and even marine oil. West Marine..look for one by you they are AMAZING

-brent