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First, I don't believe I was referring to the 4-TEC engine, and in fact, in post #3, I actually say, "disregard all that, it doesn't apply to the 4 strokes"... I was replying to Psycho Sailor, who's profile shows he has the 951, 2 stroke. But, since you did bring it up, you are right, in a way. While the 4-TEC does not have an open cooling system, it does have an open system that uses seawater in the tuned exhaust. I can't tell you how many engines I've pulled apart, that were loaded with granules of sand. There are also orifices that have certain restrictions on how much water is being used, for instance in the engines resonance performance, where water regulators get stopped up with sand. I don't work much on the 4-TEC's, because I don't have B.U.D.S. software, and don't want it. I actually don't want anything to do with the 4-TEC, only because, if something happens to it, it's an arm and a leg to get it put on a computer at your local Seadoo shop. Last count I remember, there were 14 sensors on those engines, that have direct input into the ECU and MPEM. It only takes one of those sensors to put you in limp mode. My 787cc, in my GTX, only has 2 sensors, and neither of them will shut my motor down. And, since I get a top end of 63 mph out of it, I'm happy with the performance, and speed.
Don't get me wrong, I've rode the RXP and RXT, and they are some awesome fast, and high performance skis. I loved riding it, but I would never own it. For those people with the money to throw at one, then by all means, if that's what they want to do, then I'm behind them 100%; it's just not my cup of tea.
Riding within inch's of the bottom will also prematurely wear out your impeller too. Sand is very abrasive. Anytime you are shallow enough to pick it up, then you can bet, it will eventually cause you problems down the road. Like I said, my comment was in reference to someone who I thought might be an old Navy buddy, which is why I used the term "Squid" and "Shellback"... and he does have the 2 stroke. I was in no way implying that the 4-TEC had a TLCS. Have a nice ride, stay safe, and keep it right side up!