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Revving jet ski out of water

Old 08-03-2020, 07:30 AM
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Default Revving jet ski out of water

What is the deal with people revving their jet skis after they pull out of the water? Literally, they'll pull it out of the water, go park, crank it up and rev limit it for a solid 10 seconds or so. It's almost everytime I see one!

I even see people do it with their outboards

Am I missing something?
Old 08-03-2020, 07:48 AM
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Jet skis use a water box to silence the exhaust. They are emptying their water box. You'll see a stream of water shooting out the back when they do it.
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Old 08-03-2020, 07:51 AM
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They probably think they're clearing the impeller or something.

Shouldn't be a big deal on SeaDoos as they have a closed-circuit cooling system, probably a bad idea on Yamahas which are raw water cooled.
Old 08-03-2020, 07:57 AM
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Originally Posted by Drako View Post
They probably think they're clearing the impeller or something.

Shouldn't be a big deal on SeaDoos as they have a closed-circuit cooling system, probably a bad idea on Yamahas which are raw water cooled.
No. They know that they are clearing their water boxes. No sound engine will overheat within 10s.
Old 08-03-2020, 07:59 AM
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Originally Posted by ukadrianj View Post
Jet skis use a water box to silence the exhaust. They are emptying their water box. You'll see a stream of water shooting out the back when they do it.
Yes, this is it. I do the same thing with my Yamaha 701cc jet
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Old 08-03-2020, 07:59 AM
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This is what the manufacturer recommends, it is right in the instructions in the owners manuals. Not really rev limit but over 3000 (each model may differ) for a few seconds to blast the water out of the system.
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Old 08-03-2020, 08:00 AM
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And since the cooling water is taken off the high-pressure side of the jet pump there is no rubber impeller to "run dry" when this procedure is done, so as long as it's just a brief run nothing will overheat or be damaged
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Old 08-03-2020, 08:09 AM
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They should run then dry all the way home. The heat will help dry the system out!
Old 08-03-2020, 08:10 AM
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my manual for my Yamaha waverunners stated to do EXACTLY that after running or flushing the motor....not rev limiting ...just revving it...which to an outboard may sound like over revving.

Sold my runners to a couple of similar age...periodically I ask for videos and pics of them having fun with them....nice to see them running....

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