Temperature overheat problem yamaha waverunner FX

Okay overview of the Yamaha waverunner problem I had

Temperature beeper coming on and overheating engine shuts off

Things to check

Thermostat opening ?
You can take the hose off that goes to the back and see if the thermostat is opening
When the engine reached temperature on the hose this should open and water should come out

Bad Temperature engine sensor
there are two the one under the exhaust on the right side if facing front of the ski is the engine safety shut off if the engine overheats this sensor will keep you from ruining your engine from overheating it.
Check the basics first before suspecting this and you can also see it operation with the YDS software
The other temperature sensor is for the computer to get air fuel ratio

Restriction in pickup or hose to engine-
The pickup has a strainer to keep the larger particles from entering the engine
Possibly something could be lodged in this strainer or the hose blocking the water from entering the engine

Sand in engine block from running in sandy areas
Sand can accumulate in the engine around the cylinders in the cooling jacket
This can cause improper cooling, possibly the sand can get hardened and stuck in this area

Advise not to run in the sand where the jet pump can suck up the sand into the engine
I did the "back flush" to ensure that there was no sand or other debris in the hoses or strainer

My problem was the worst of all of them, the engine had a bad rod bearing possibly from a previous problem with a bad oil filter.

The rod bearing was causing friction but only under a load would it cause the engine to shut down on over heat.

DO NOT RUN THE ENGINE WITH THE TEMPERATURE SENOR UNPLUGGED you can cause permanent damage if there is another problem!

I initially suspected the sensor since after unplugging the sensor the engine would run fine but later the engine overheated and shut down smelled burnt and some damage to the crankshaft and the rod and the engine locked up

It could have been repaired with a lower case, used crankshaft and a rod but I did not have the time
Sad... this engine had been rebuilt a few years back and ran very good until the fatal day that the oil filter rusted around where it is crimped (near the gasket)
 It even ran another season almost 6 sessions after this

This rust started an oil leak around the base of the filter   and later while out in the ocean leaked all of the oil into the bilge!