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  1. Lots of MFD technical info can be found via my...

    Lots of MFD technical info can be found via my signature links. Most of the electrical signals are fairly simple. The fuel and oil level sensors need a low voltage, low current power source and a...
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    The trailer frame itself, and the position of the...

    The trailer frame itself, and the position of the hull on the trailer, can affect vibration resonance. That is why it was suggested to shift the hull forward on the trailer, and/or shift the axle...
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    Which model year GP1800 did you start with? ...

    Which model year GP1800 did you start with?

    The stock GP1800 supercharger wheel used in 2017 is different from the more recent version, correct?
  4. Totally stock or top speed increased above stock?...

    Totally stock or top speed increased above stock?

    What kinds of water and riding style?
  5. Thanks for clarifying that. Sounds like the...

    Thanks for clarifying that. Sounds like the original dealer handing of the hull before delivery would be the only other possible source of localized hull stress, which would be speculation at this...
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    Sponsons are on my ‘should do’ list. I have not found a lot of useful info on how the different sponsons compare in actual use. Which means I might have to buy 2 or 3 different sets and experiment....
  7. Can we circle back to why/how the cracking might...

    Can we circle back to why/how the cracking might have begin?

    Put another way, has the hull bottom ever experienced a localized/focused lifting force just forward of the ride plate?
  8. FS Also good to post the location.

    Also good to post the location.
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    I use trim to adjust hull ride as water...

    I use trim to adjust hull ride as water conditions vary. Trim up in rough water tends to make for a softer ride, but I cannot go as fast without the jet pump unhooking. With trim down the bow is...
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    We prefer hulls that have a 'responsive' feel...

    We prefer hulls that have a 'responsive' feel when riding.

    http://greenhulk.net/forums/attachment.php?attachmentid=455357&stc=1

    The 2017 FX hull seemed too large (for us) and not as responsive...
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    Which model year? The ECU configuration changed...

    Which model year? The ECU configuration changed from three connectors to two connectors, starting in 2018.
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    Octane boosters do not create fuel that is ‘the same’ as using gasoline of the correct octane. Ongoing use of octane boost with every tank is potentially adverse to the Yamaha engine warranty. Boost...
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    Yamaha SVHO engine requires 91 octane gasoline. ...

    Yamaha SVHO engine requires 91 octane gasoline.

    Can be with or without ethanol, engine runs the same.

    FX SVHO and GP1800R SVHO models.
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    What model years are the VXR and VX HO Cruiser...

    What model years are the VXR and VX HO Cruiser you are considering?

    For the 1.8 liter engine in 2015 onwards VXR and VX HO Cruiser, the main difference is the seat style, cruiser high seating...
  15. I do not recall the specific brand name, it was...

    I do not recall the specific brand name, it was double wall reinforced flexible hose. I often use double wall marine grade fuel hose but in this case I think it was just flexible clear hose.

    ...
  16. Looks like the hose material might have been...

    Looks like the hose material might have been burned from the waterbox? Is that possible that somehow the waterbox was run without water injection long enough to get really hot?

    In any case, the...
  17. That is the factory flush hose. Connects to a...

    That is the factory flush hose. Connects to a capped flush fitting somewhere near the mid-wall.

    What year and model watercraft is this?
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    You can edit the subject line of your original...

    You can edit the subject line of your original post, and that will also change the thread title.

    Tip: Use advanced Mode to edit the subject line
  19. The Yamaha 2019 GP1800R SVHO intake grate is...

    The Yamaha 2019 GP1800R SVHO intake grate is aluminum.

    You may want to consider installing the stainless steel Riva intake grate. Much stronger material.
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    Black wire is generally negative/ground. Some...

    Black wire is generally negative/ground.

    Some wire diagrams have been posted somewhere around here, IIRC.
  21. Well, the major difference would be all the turbo...

    Well, the major difference would be all the turbo stuff and supporting mods. And the tuning, wrenching, and so on.

    How many hours per year do you expect to ride?

    What is it about supercharging...
  22. What is your target top speed? What intake...

    What is your target top speed?

    What intake grate and ride plate?

    Transom plate tapered?

    Do you intend to change to the 2020 160mm jet pump?

    How fast is it going now, with the supercharger?
  23. I am not familiar with the specifics for...

    I am not familiar with the specifics for repairing cracked CM-Tech hull material, nor in that area of the hull.

    That does seem to be an unusual area to crack.

    How is this hull stored between...
  24. This is the fuel shut-off valve for a carburetor...

    This is the fuel shut-off valve for a carburetor engine, correct?

    A good new replacement fuel valve is probably not that expensive. It is important that your fuel valve not leak fuel or fumes into...
  25. This watercraft was purchased used, from the...

    This watercraft was purchased used, from the dealer, correct?

    How many running hours on it since new?

    What kinds of water would you be riding? Ocean/salt, rivers, fresh water?
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