This will cause overheating whenever you operate the motor not just after flushing.

Yamaha jet boat engine overheating. With most boats it isnt necessary to have ear protection while youre out on the water. This has happen about 4 or 5 times in the past two years. 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.

I was on the water Saturday and noticed that the starboard engine needed more throttle to keep the same RPM as the port engine. The boat is a 1 year old Yamaha SX210 - the right engine overheat warning came on and I shut the engine down and checked the intakes - no clogs. 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 is how to unclog it with a thin wire and ear muffs.

You are correct in your assumption that running the engines on the flush kits without getting an overheat warning means the problem is resolved. Be sure to turn on the water immediately after starting the engine to prevent engine 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.

Restarted and warning came back on - shut the engine down and ran back to the dock on one engine. Water cooling system clogged. 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.

Adequate stockholding of critical spare parts is essential in the marine industry. I also noticed that the Engine Overheat Light was on. As soon as they cross that 30-mph threshold they double in decibels.