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I just read through this whole thread some areas twice, as I am wanting to do something about being prepared for an engine(s) failure on the water, and not having to go at wake speeds for hours to limp it home. It wouldn't surprise me if every dealer gave you a different answer. I just got off the phone with the dealership I purchased mine from and talked to the service department, they said they encourage them, that the tow valves are a great thing and they recommend them. They said there would be no warranty issues for something like that because it is protecting the boat from severe damage. I think I am leaning towards the Island Racing valves.Ok, so I've given this topic lots of consideration. I like to prepare for the worst, within reason; everybody has their comfort zone. I have a masters degree in chemical engineering, and I know that installing a valve will always create a resistance to flow relative to a no-valve scenario. In this case, I'd have to dig into my old textbooks to figure out what the reduction in flow would be with the valve wide open after I install some pressure valves before and after the ball valve. I'm not going to do this because I spoke with Yamaha and asked them if they knew what kind of tolerance there was with respect to reducing flow by adding a valve, and their answer was simple, "we don't know, we've never tested this, so don't do it". Obviously many have successfully done this on many models, but if you have a warranty, and your engine fails, this is an easy one for Yamaha to use to void your warranty.
That's my perspective.
I'm going with the radiator hose clamps.
Maybe not the easiest to clamp on in rough seas while laying between two hot engines, but that's what I'm comfortable with. And in the end, maybe I'll have some scars to use as a story to tell over a beer or two, or three, or four...
Just my 2 cents.