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    Yamaha 2003 F90 TLRB Mystery Plug

    Connectors for providing data to a Yamaha tachometer and trim gauge.
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    Flushing 2019 115hp Yamaha 4 stroke

    That is the typical way that I have seen it done.
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    Flushing 2019 115hp Yamaha 4 stroke

    This should make you feel better.
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    Flushing 2019 115hp Yamaha 4 stroke

    Always remember. All Yams are created equal. Some are just more equal than others.
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    Flushing 2019 115hp Yamaha 4 stroke

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    Flushing 2019 115hp Yamaha 4 stroke

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    Flushing 2019 115hp Yamaha 4 stroke

    I hope that you realize that as water is being applied to the block, some of it is being lost down and out of the water pump tube and via other ways. The longer the hoses used the less water pressure there will be to the block. The less the pressure the less the water flow. You may be cobbing a...
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    Flushing 2019 115hp Yamaha 4 stroke

    Seems too easy to follow the flush hose from just inside the lower cowling to where it connects with the block but perhaps this road map may help.
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    Flushing 2019 115hp Yamaha 4 stroke

    I can understand a flush system that begins in the boat but they all run to the motor. From outside the motor and then into the motor. Using the Yam fitting installed on the outside of the motor. Are you contemplating drilling new holes into the cowl so as to completely bypass the Yam system...
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    Any "significant" differences (non-fit) between early/late Yamaha mid-sections?

    Too bad the model of the motor is unknown.
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    Any "significant" differences (non-fit) between early/late Yamaha mid-sections?

    The last two characters of a Yamaha part number denote the colour code or finish code.
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    Please help with converting 150 hpdi from 25" to 20" shaft

    It is all available to you in the Yamaha parts catalogs. Www.yamahaoutboards.com http://yamahamc.partsandwarranty.com/SyndicateNav.cfm?NodeID=0
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    Tell Tail pressure difference

    Oh boy. Now you have gone and done it. Stand by for incoming.
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    Tell Tail pressure difference

    Water is taking a circuitous route from the water pump to the tell take exit port. Easily disrupted such that the flow from two side by side motors might not be similar.
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    Tell Tail pressure difference

    Motors are reported to be peeing just fine when underway. If the tell tale port was clogged one might think that would not be the case.
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    Tell Tail pressure difference

    If one could look at pressures and temperatures to a fine enough degree one would find that two of the exact same model won't be operating exactly the same. Which is why most motor makers provide a range for data.
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    Tell Tail pressure difference

    As to a possible cause, could just be a variation in a hose. A difference in a fuel cooler. Or a pipe from the lower unit.
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    Tell Tail pressure difference

    No two Yams are alike. Just the nature of the beast.
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    2005 90hp Yam no spark.

    It is difficult to keep up with what is doing what within any given Yam.
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    2005 90hp Yam no spark.

    Only one pulser coil.
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