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  1. #1

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    Help understanding GPR cooling hoses and flows GP1200R

    Trying to understand in detail how the cooling systems works and where the cooling water flows. I am referencing a GP1200R service manual.

    Jet pump:
    1) I can't find where the outlet of that strainer is, near Detail 15. See discussion below, outlet is internal to the pump




    Transom:

    1) Where does the In come from? Pump
    2) Where does the In go? Exhaust Manifold
    2) Where does the Out come from? Muffler
    4) Where does the Out go? Pump



    Header and Head:
    Updated based on discussion below






    Mid pipe:
    Updated based on discussion below



    Stock muffler:
    Updated based on discussion below
    Last edited by steelmesh; 04-09-2019 at 02:26 PM. Reason: Fidelity optimizations


  2. #2
    Is there a problem with the ski?

  3. #3
    butterbean_29512's Avatar
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    The high hose aft of the d plate/cat is the engine overboard hose. The inlet connection is cast into the pump and transom plate. You can look in the pump area and see the strainer inlet for it.

  4. #4
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    Quote Originally Posted by butterbean_29512 View Post
    The high hose aft of the d plate/cat is the engine overboard hose. The inlet connection is cast into the pump and transom plate. You can look in the pump area and see the strainer inlet for it.
    Yes, there is no inlet hose that you can see on the pump.
    Generally speaking, most 2 stroke watercraft........water comes in from the pump and goes straight to the cylinder area or exhaust manifold, because that's the hottest area. Then it flows around the cylinders and head. Then it makes it's way into the water jacket of the exhaust pipe which is where the pisser is normally tied in. Then the last portion of the jacketed area would spit into the inner exhaust flow path to keep the rubber hoses cool and/or any remaining water dumps back out the rear in the pump area.

  5. #5

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    Quote Originally Posted by butterbean_29512 View Post
    The high hose aft of the d plate/cat is the engine overboard hose. The inlet connection is cast into the pump and transom plate. You can look in the pump area and see the strainer inlet for it.
    I updated the diagram notes:

    For the high hose aft of the d plate, where does this water come from?

    Also, do you know what the [A] is referring to? Is that another overboard pisser hose?


  6. #6

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    Quote Originally Posted by Cat Tech View Post
    Is there a problem with the ski?
    Nope, there is a problem with the Operator who is trying to completely understand how water is flowing their his engine and exhaust

  7. #7
    Myself's Avatar
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    The yellow highlighted "A" is the pisser from the rubber boot. The larger one by number 7 is the extra cooling water flow after it has circulated through the system. That will be hot water going out the rear by the pump. On the 1200r engine the water comes into the lower exhaust manifold, then goes into the cylinders and up into the head. From there it flows up through the 2 hoses into the jacket of the exhaust pipe. Then down the exhaust and out the rear.

  8. #8

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    Quote Originally Posted by Myself View Post
    The yellow highlighted "A" is the pisser from the rubber boot. The larger one by number 7 is the extra cooling water flow after it has circulated through the system. That will be hot water going out the rear by the pump. On the 1200r engine the water comes into the lower exhaust manifold, then goes into the cylinders and up into the head. From there it flows up through the 2 hoses into the jacket of the exhaust pipe. Then down the exhaust and out the rear.
    Updated the "muffler" diagram:



    Is the Out in the above diagram the same as the Out below? The sketch of the nipple for the out hose different than 7 above... Page 140 of the LIT manual for the GP1200R calls 2 "Cooling water outlet", 4 is called "Cooling water inlet"



    DISREGARD ATTACHED IMAGE, same as the second one anyway
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  9. #9
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    Yes same, yes your drawings are correct.

  10. #10

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    Quote Originally Posted by Myself View Post
    Yes same, yes your drawings are correct.

    You're not off the hook just yet:

    Does the IN from the transom here go to the exhaust manifold in the follow diagram then?




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