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post #1 of 30 (permalink) Old 08-08-2019, 11:43 PM Thread Starter
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Yamaha ex

Aug 8 '19

Just bought a new EX Sport. AFTER I bought it, much to my horror, found in the back of the manual in small print that it cannot be towed at over 5mph because of the way the cooling system is set up - faster than 5 mph will flood and thus destroy the motor. I bought and installed the WAVE EATER shut-off valve - but what a pain - each time we use the "ski" I have to pull the seat off & reach down to remember to turn the WAVE EATER valve for either "tow" or "run".

QUESTION - anyone know of, or come up with a valve with a handle we can mount outside the hull, so we can quickly change the cooling system depending on whether we want to run the motor or tow ?
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post #2 of 30 (permalink) Old 08-09-2019, 01:52 AM
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Originally Posted by 6686L View Post
Aug 8 '19

Just bought a new EX Sport. AFTER I bought it, much to my horror, found in the back of the manual in small print that it cannot be towed at over 5mph because of the way the cooling system is set up - faster than 5 mph will flood and thus destroy the motor. I bought and installed the WAVE EATER shut-off valve - but what a pain - each time we use the "ski" I have to pull the seat off & reach down to remember to turn the WAVE EATER valve for either "tow" or "run".

QUESTION - anyone know of, or come up with a valve with a handle we can mount outside the hull, so we can quickly change the cooling system depending on whether we want to run the motor or tow ?
Putting a valve in the line is the only way. No where outside to connect to cooling flow as it's all internal to the pump.
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post #3 of 30 (permalink) Old 08-09-2019, 07:50 AM
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All pwc's are setup this way.
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post #4 of 30 (permalink) Old 08-09-2019, 09:01 AM Thread Starter
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My apologies to Dave & Rad for not being more clear.

My question was about the "small print" in the back of the manual for my brand new EX Sport. Where they warn you that it cannot be towed at more than 5 mph. (Didn't see that in page after page of operator info. in the front of the manual) Didn't see that in page after page of advertising I reviewed before buying it - material both at the dealer's show-room, and on the Internet.

I cant imagine anything more stupid or potentially damaging to the consumer, than designing something that cannot be towed at more than 5 mph. But that's the way this one ismade.

Not clear where Rod got the idea "all pwc's are set up this way" - guess he never heard of Seadoo - I own one - been towing pwc's behind our cabin cruiser for some thirty years now. As a side-note, the Sea Doo that is in direct competition to the EX has a "closed cooling system" so you could tow it a hundred mph and would have no effect on the cooling system. My older SeaDoo GTX is doing fine after many years of towing.

Anyway, I failed to explain I was not asking about cutting a couple of big holes thru the side of my EX to re-route the water cooling hoses outside. Of course that is absurd - sorry I gave that impression. What I was asking about if anyone knows of a water shut-off valve in which the handle could be outside the hull - of course the valve body itself and the hose would remain where it belongs, inside the hull. My local hardware store has all manner of "ball type" shut off valves for a couple of dollars, just like the Wave Eater I paid twenty bucks for. But like the Wave Eater there is no way to get the handle off the valve body for exterior mounting of the handle.

Surely someone has come up with a way to stop this idiocy with a simple ball valve like the Wave Eater - - I would not have bought a Yamaha product if this nonsense had been disclosed on their advertising.

Yes, I "get it" - for now...every time we tow our EX to a nice beach, I've got to lift off the seat, pull off the storage box, reach down into the hull to operate the Wave Eater. C'mon guys....some ideas, please ?
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post #5 of 30 (permalink) Old 08-09-2019, 02:24 PM
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Any ski that uses the pump to supply cooling water has the potential to flood the motor when towed. That being said. Yamaha just noted it in there manual is all. due to the growing tow behind movement and potential for damage.
Just because you've tow your Sea-Doo without incident doesn't mean there wasn't the potential to do damage. I've towed my gpr and wave venture faster than that with no issue either. But the possibility is still there.

My suggestion would be to search the web for a through bulkhead valve. Or contact mcmaster-car and ask what they may have.
But be advised that if you raise the cooling line up above it's routed location the motor won't fully drain for winter storage if freezing is involved.
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post #6 of 30 (permalink) Old 08-09-2019, 03:50 PM
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Another option is to cover the intake with something to limit or stop water flow through the pump.
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post #7 of 30 (permalink) Old 08-09-2019, 03:56 PM Thread Starter
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Putting a valve in the line is the only way. No where outside to connect to cooling flow as it's all internal to the pump.
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You don't understand. Obviously, the shut-off valve has to be in the water supply line - and as another poster noted, if raised up, would constitute a "loop" making it a more complicated issue for winter storage.

A "bulk-head" valve is the obvious answer - but just got another idea. Automotive heater shut-off valves. These are typically remote -power operated. I wonder if some cars use one that is electric - if that is the case, I will simply replace the Wave eater with a valve like that, and wire a switch, clearly marked, on the outside.
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post #8 of 30 (permalink) Old 08-09-2019, 05:37 PM
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A heater control valve is best bet but I'd go manual on a choke cable.
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post #9 of 30 (permalink) Old 08-09-2019, 07:45 PM Thread Starter
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A heater control valve is best bet but I'd go manual on a choke cable.
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Now that is a durn good idea !
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post #10 of 30 (permalink) Old 08-10-2019, 05:35 AM
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Yes the new Seadoo's have a closed system for engine cooling, but still incorporate water cooling for the exhaust if I remember correctly. I will do more research to verify this.

It was Dave that suggested the valve in the supply line.

When towing over a certain mph (most were stated at 10mph) it pressurizes the jet pump, which in turn pushes water up into the supply line and through the system as if the engine was running. The problem comes from filling the water box and exhaust because the engine is not running to push that water out the exhaust. Eventually it will start to fill the engine through the exhaust ports. The 4 strokes are not as susceptible to damage from water ingestion as the 2 strokes, but require more work to get them running again if the crank case actually got water in it vs just some in the cyl's.

Every owners manual I have read, and some service manuals stated the towing limitations, but most where in the front of the manual under care.
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