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  1. #1

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    Riva S2 Stinger with Jetworks valve modification holeshot kit

    I've got a GP1200R with the Riva S2 Stinger (2 ports axially drilled).

    Looks like there are 2 internal angle drilled holes that spray water into the exhaust stream. I got a 3/8" jetworks valve and I think the idea is to plug the 2 angle holes then weld a bung to the pipe as close to the S2 as possible to inject water into the exhaust there using the jetworks valve.

    Does this make sense to achieve a dry waterbox at low rpms?
    Last edited by K447; 05-21-2019 at 09:07 PM. Reason: Riva S2 Stinger

  2. #2
    Tool Bag water worx's Avatar
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    Picture would help your cause....

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    Quote Originally Posted by water worx View Post
    Picture would help your cause....
    Good idea stand by


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  5. #5

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    This is normal right, spraying water directly into the exhaust stream? I ask if it's normal because that is quite unorthodoxed compared all land based recreational vehicles. My sketches above are just my current understanding, I am open to being mistaken with my assumptions.

  6. #6
    Click avatar for tech links/info K447's Avatar
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    Quote Originally Posted by steelmesh View Post
    This is normal right, spraying water directly into the exhaust stream? ...
    Note: The following is not Yamaha specific.

    Unlike land vehicles, PWC have an essentially unlimited supply of raw water for cooling flow. The jet pump is continually supplying raw water into the cooling system.

    With plenty of water available for other purposes, like injecting raw water spray directly into the hot exhaust gasses . The water spray cools the hot exhaust flow enough that the downstream exhaust components do not need a water jacket and can even use rubber couplings between the metal sections.

    Inside the hull there is very little cooling from air flow, hence the hot zones of engine and exhaust must have a water jacket. This is why the exhaust system has, and needs, a water jacket right up to where the water is injected.

    If the water injection spray into the exhaust is clogged or over restricted then the downstream exhaust hardware can overheat, melt/burn the rubber stuff and potentially flood the hull.


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