96' Polaris SLT700 Jet Ski, Overheating?

[kcwhay]

My jet ski is used and well ridden in fresh water only; I keep up on as much maintenance as I can, and I replaced the thermostat recently and change the plugs, new oil, etc. every season. My overheating sensor is going off, I inspected it and the wire but it looks ok.

I started it up, dry out of storage like I do every year, and it fired right up but the tone sounded right away, and I only had it running less than 5 sec. The tone sounded last year in the water, I would run it, fairly hard, and then I would let it idle and the tone would sound and I would shut it off and it would be hard to start...I replaced the thermostat but found out last year it did not resolve the problem. The tone still went off when I had it idling in the water but only after it was started for a minute or so. What are some possibilities that would cause the sensor to go off with my situation?

[John L]

Polaris's seem to have that problem a lot

[SxySparki]

I'm thinking that some kind of water pump in the engine is on its way out.....