I have a '97 SeaDoo GSX (less than 200hrs) and the infrequent times I take it out lately, I notice it emits a lot white/blue smoke from the exhaust, more than it used to, which I assume it means it is running too rich?
When I have it on the trailer and run it with a hose connected to it, I notice that the water coming out of the exhaust is generally clear, until I rev the engine, and the water comes out a dark grey, almost black.

Does this sound like something I need to get checked out?