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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.
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    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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    Connect alternator outputs of two motors to battery bank

    Many twin engine airplanes have but one battery. To save weight. Both alternators (one from each motor) charge the battery at the same time.
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    Mercury 3.5hp 2012 outboard hard to start due to over compression? Cause? How to fix?

    There normally no over compression. It is just that normal compression makes a four stroke motor hard to pull start. A decompression mechanism momentarily prevents full compression when a starter rope is pulled.
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    F115 - no signal to #2 injector

    When you use the term NICO are you referring to what I know as a Noid light? Light flashes as the ECU completes a ground to an injector?
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