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  1. #1

    Flushing a 97 1100 STX, does it have to be running?

    I have looked inside all the exhaust piping that has a water jacket and do not see any place it is innerconnected. If all the gaskets are good it seems you should be able to connect a hose and run water thru the cooling system with the motor off. Is this the case? If not can someone explain how water can fill the case if flushed with the motor not running.


  2. #2
    john zigler's Avatar
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    DO NOT run water, with out the motor running.

    your pipe does have water injected into the exh, and it will back up into your motor, within seconds.

    always start motor, turn on water, shut off water, then shut off motor.

    also do not run on the hose for more than a minute or two.

  3. #3
    I do not see where the water is injected into the exhaust, can you tell me where it is connected?

    Quote Originally Posted by john zigler View Post
    DO NOT run water, with out the motor running.

    your pipe does have water injected into the exh, and it will back up into your motor, within seconds.

    always start motor, turn on water, shut off water, then shut off motor.

    also do not run on the hose for more than a minute or two.

  4. #4
    steve45's Avatar
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    The water jackets around the cylinders dump into passages in the exhaust manifold. As mentioned, DON'T run the water unless the engine is running.

    You can run the 2-strokes on the hose as long as you want.

  5. #5
    john zigler's Avatar
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    water is injected in the pipe body. you cannot "see" where it is, withough complete dissasembly.

    i STILL do not recomend running on a hose more than a minute or two. your drive line, and pump are not being cooled, like if it is in the water. there is no reason to run it any longer anyway, when flushing.

  6. #6
    Thanks for the replies, just trying to understand how the cooling works a little better.

  7. #7
    steve45's Avatar
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    Since I have the engine out of my STX 1100, I was going to take a picture for you. However, I forgot that, while there are passages from the cylinders to the exhaust manifold and expansion chamber, the gasket has a very small hole restricting the flow of water. You still get some water that way, but there is also a hose that attaches directly to the expansion chamber.

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