![]() ![]() It’s because the water intakes are different and you need to keep this in mind. I’ve seen several cases where a jet boat will run fine on the hose but not when in the water. Where the flushing port enters is not the same as this intake. The jet pump has a small hole in the housing next to the impeller that is made to siphon water in and pump it through the compartments that need outside water. The jet pump not only moves you forward but is also the water pump that is used to cool the engine. While flushing is fine, it’s a different intake then where your boat naturally gets water. You can flush a jet boat just like any other boat we’ll talk more about that below. The Proper Channels Are Not Getting Water You also have specific fittings that need to be wet to work correctly. This is another reason not to run your jet boat out of the water for too long. With the bearings jumping around without the support of the water they wear out quicker. If they’re not in the water, they’re not floating, so they get trashed around in the air. The pump and bearings are meant to “float” so there is a good bit of tolerance in the connections. This is your bearings making all this noise. You may notice that the jet boat’s pump is much louder and sounds like a bunch of coins raddling in a metal can when out of the water. When a jet boat is not in the water, the pump and bearings are not being cooled and lubricated. If you do get under a jet boat, make sure the wheels are chalked off and disconnect the battery. This is why you must check under and around the boat to make sure nothing is in the way. If anything is near the intake of a jet boat, it runs the risk of being sucked up. Extreme caution must be considered because when the jet boat engine is on, it means the impeller is spinning. Starting a jet boat out of the water is more or less a way to make sure things are working correctly before heading to the water. You should also not be walking away from a running jet boat when it’s not in the water. You should not be using the alarms as your cue to turn the engine off. Once you’re getting to the point of alarms, you need to shut the engine off now and let it cool down. Most boats will have alarms going off when the boat overheats, with some even shutting the engine down. Not only this but metal parts start to weld together, this is not good. Plastic parts start to melt, and electrical connections and bolts begin to loosen up beyond where they need to be. 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. Yamaha jet boats completely use water to cool everything along with the old school jet boats. There exist some jet boats that have closed-loop cooling systems like Sea-Doo and Scarab jet boats, but they still take in water to cool certain things like the exhaust. A Jet Boat Can Overheat If It’s Not in the WaterĮvery jet boat takes in water to cool something. There are several reasons why you don’t want to run your jet boat out of the water for too long. A jet boat can be run out of the water for a maximum of 30 seconds. ![]()
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