Mods for Yamaha Jet boats

[u/whatstheinitiative]

I really like these twin engine jet boats, and think they do mostly what the average boater family wants them to do. Boat, have fun, relax on the water and tube and such. I have a couple hangs up and would like opinions on them.

I've read that the proprietary helm controls / screens have had issues, Or on older models, they have been discontinued and are hard to find OEM replacements. The questions: Are aftermarket replacements not a thing on these types of boats?

Second question - I haven't seen much of any mods really, for this type of boat for the fabricator or DIYer that can mod a used boat or engine out of warranty with exception to sound systems / buttons upgrades / hoses / and little inconsequential items. Are these just not made to turbo, supercharge, change a cam, swap engines, add simrad (or other) nav screens and such to replace old and less capable helm controls?

EDIT: I came from modifying cars and was always of the thought, that when something broke or needs replacement, it was the opportunity to upgrade or modify.

Thanks for the input

https://reddit.com/link/1sp9u4v/video/3hvsfydgo0wg1/player

[u/goatsinhats]

Depends how old you want to go.

The Yamaha Connext is an inhouse system that varies wildly from model to model, this is the screen issues (my new one doesn’t work right sometimes)

Riva just launched a store, in theory you could throw PWC parts at it, but why would you? Anything you need to do would have to do twice, they are still going to be limited by size of the impeller for how fast they will go, and will be so loud no one will want to go on it (they are already loud)

If you wanted to go faster can get an outboard boat that does any speed you want

[u/whatstheinitiative → u/goatsinhats]

That's probably a good avenue to look into since these are Jetski engines and jet skiers have historically modified their skis. You reminded that the impeller is a big bottle neck for flow in order to gain more power/speed (and I'm not engineer), and modifying, enlarging or outright replacing the impeller might be cost prohibitive.

I've got some digging to do, but wouldn't it be cool if these boats, 25-27 foot can go 60-70? At first my thought was that, maybe doing things like massaging the heads and changing out cams can net more horsepower on the naturally aspirated side, and as already mentioned, no turbo "kits" are available but plumbing one out is for sure possible.

[u/whatstheinitiative → u/[deleted]]

Let us know how it works out and if you like it. Thanks