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    Does anyone know what this plug is called ??

    If it were a Yamaha it would be called a cover.
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    Does anyone know what this plug is called ??

    Model and make still not known.
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    Does anyone know what this plug is called ??

    Is the model of the motor unknown?
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    2 vent plugs?

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    2 vent plugs?

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    2 vent plugs?

    Top hole is the vent/fill level hole. Bottom hole is the drain hole. Ignore the hole in the middle.
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    Remote battery charging hook up

    I am not understanding the words about the electricity running backwards. Electricity (current if you will) runs to a battery and from a battery. Not at the same time but when the battery is being charged and when the battery is powering components.
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    Yamaha S200TXRU

    There are carburetted Saltwater Series models and their are EFI Saltwater Series models. The controls and gauges are interchangeable.
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    Mercury 3.5hp 2012 outboard hard to start due to over compression? Cause? How to fix?

    Found this FWIW.
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    2021 f200xb

    If no switches on the back you have an antiquated gauge. Time to pony up for new one.
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    Mercury 3.5hp 2012 outboard hard to start due to over compression? Cause? How to fix?

    Something leads me to believe that the gizmo seen on the cam shaft for a Mercury Marine 3.5 four stroke model is related to the compression release mechanism.
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    Mercury 3.5hp 2012 outboard hard to start due to over compression? Cause? How to fix?

    Don't know if this AI is true or not.
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    Connect alternator outputs of two motors to battery bank

    All alternator regulators have diodes that prevent the flow of current from a battery to the alternator. I don't see a problem running both motors at the same time connected to the one battery. Each battery will contribute a bit of current to the battery. But as the man suggests, if there is...
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    Mercury 3.5hp 2012 outboard hard to start due to over compression? Cause? How to fix?

    I don't know personally that your motor uses a decompression mechanism. My comments were based on you saying that it has one. Have you thought about the possibility of a lower unit problem causing the motor to be difficult to pull start? Easy enough to remove the lower unit and then use the...
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    Mercury 3.5hp 2012 outboard hard to start due to over compression? Cause? How to fix?

    If the compression release mechanism is not working that might fool someone into thinking the compression is excessive.
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    Broken trigger wire

    Depends upon the ignition system.
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    25 HP Yamaha 4 stroke backfire

    I think testing without the motor being loaded is somewhat problematic.
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    Charging a LiFePO4 via an Inverter

    Very true. Using battery current to produce current to charge a battery.
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    Connect alternator outputs of two motors to battery bank

    Diagram from Evinrude showing two motors providing charge current to one battery.
  20. B

    Connect alternator outputs of two motors to battery bank

    Diagram from Yamaha showing two motors providing charge current to one battery.
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