Cooling water is supplied to the engines by the high pressure side of each jet pump.

Yamaha jet boat engine overheating. I was able to get a decent feel for whether or not one of the heads was completely blocked by pulling the t-stats and dumping water down each side. Clean the engine bay after you allow the engine to cool and before you flush it. What you need to do is determine why the engine s are not getting enough cooling water to them.

With most boats it isnt necessary to have ear protection while youre out on the water. Restarted and warning came back on - shut the engine down and ran back to the dock on one engine. Ad Rely on SKF Marine and Simplex to deliver what you need when you need it.

I shut down both engines and find the port engine is not hot or showing any signs of overheating. Jet boats go an average of 25 mph but can go way beyond that if the water jets are more efficient around 60 mph. I was on the water Saturday and noticed that the starboard engine needed more throttle to keep the same RPM as the port engine.

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. Dont forget to remove the connect adapter from the flushing connector as it can lead to the engine overheating as well. Be sure to turn on the water immediately after starting the engine to prevent engine overheating.

I immediately turned off the starboard engine and returned home on one engine no wake speed. I let the boat sit for approximately 20 minutes and restart both engines the over heat warning is gone and I run the boat the rest of the day and the next month or so with no over heat warnings. This means if a jet boat is not getting water the engine is not being cooled.

Yamaha Warning Buzzer -- Overheating. Keep the RPMs low if youre running your jet ski out of the water as high RPMs can quickly overheat the engine. Yamaha jet boats completely use water to cool everything along with the old school jet boats.