They are fairly cheap on ebay as stated above make sure you have good flow out of your cooling holes from there if you can confirm it is hot we can help you narrow it down on your cooling lines.

Yamaha jet boat engine overheating. When you rinse the engine compartment with fresh water take care not to spray the electronics. I shut down both engines and find the port engine is not hot or showing any signs of overheating. An engine that is overheating is being destroyed along with anything connected to it.

This means if a jet boat is not getting water the engine is not being cooled. Checked under the boat and flushed the engine - could not duplicate the problem. Yamaha Warning Buzzer -- Overheating.

While myriad of circumstances can cause an engine to overheat it is highly preventable in most cases starting with ample water drawn into the intakes. You should invest in a Yamaha Diagnostic System YDS you can hook it up to your engines and see what is happening internally especially the temperature. Dont forget to remove the connect adapter from the flushing connector as it can lead to the engine overheating as well.

With most boats it isnt necessary to have ear protection while youre out on the water. If the engine stops while flushing turn the water supply off immediately repeat previous step and continue. This is how to unclog it with a thin wire and ear muffs.

Unfortunately thats not necessarily the case with Jet boats. Be sure to turn on the water immediately after starting the engine to prevent engine overheating. Jet Boat Overheating - How To Install a 12V Electric Raw Water Pump Engine Temperature Gauge - YouTube.

This will cause overheating whenever you operate the motor not just after flushing. Ad Rely on SKF Marine and Simplex to deliver what you need when you need it. Restarted and warning came back on - shut the engine down and ran back to the dock on one engine.