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  1. #1

    Join Date
    Apr 2008
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    Coffman pipe on 750 sx

    Hi all,
    Could someone give me a little advice on how to
    hook up the water lines on this coffman pipe?
    There are 3 nozzles on the head pipe
    One on the chamber
    And one on the long tube that runs back to the waterbox.
    Also do you still use the temp sensor when you add
    a pipe on a 750 sx?
    My cylinder head has 2 outlets.


    I will try to post a few pics

    Thank,
    CHRIS.....
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  2. #2
    thesepaperwings's Avatar
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    You don't really need duel cooling for that set up, are you going to run a pisser or no pisser?

  3. #3
    thesepaperwings's Avatar
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    What carbs are you running, just curious?

  4. #4

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    Apr 2008
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    wisconsin
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    It has twin 46mm mikuni's

    I think I can run one of the outlets from the head to a pisser.
    And I know the other outlet from the head goes to the nozzle by the
    flange on the head pipe.
    Its the other 2 nozzles on the head pipe , the one on the chamber,
    and the one on the long thin tube that I am not sure how to hook up.
    Also should I still hook up the temp. sensor?

    How about, one nozzle from head pipe to main chamber nozzle?
    And the other nozzle on head pipe to nozzle on the thin tube?
    Maybe tee the the first head outlet ,one side to pisser and other side
    to temp sensor??

  5. #5
    thesepaperwings's Avatar
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    Lots of different ways to do it but this is what I would do.

    1. Head to first fitting on head pipe.
    2. Head to T. T1 to second fitting, T2 to fifth fitting.
    3. Third fitting to forth fitting.

    If you feel like it is getting to much water then T the first line with a pisser.
    Personaly i would just put a resistor in teh temp sensor but that's just me.

    I have a R&D intake manifold that will fit your ski that I'm trying to get rid of if you are interested.

  6. #6

    Join Date
    Apr 2008
    Location
    wisconsin
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    Thanks for the advice, and I will give the manifold some thought.

    CHRIS....

  7. #7
    SXR Guru
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    I ran the R&D and it is basically the same set up. I ran water from the head directly to the front fitting on the head pipe. The fitting on the back of the head pipe I ran to the stinger of the exhaust. I ran the second fitting off the head directly overboard but restricted (mikuni jet). You can T that line and run some water to piece going to the waterbox. That is to keep it quiet. My suggestion would to be remove the pump as well and tap out the 3/8" water fitting and put a 1/2" fitting and 1/2" line back there to increase the water volume. You will need to change the water line inside the hull as well. What prop are you running and what is the bore of the exit nozzle?

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