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    Help with Engine ID / prop

    Too much work. OP wants to be spoon fed information. Probably then biitch about the cost of whatever propeller was recommended.
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    2003 Mercury 90HP 4 Stroke Grounds

    Never heard that term before. Now I am wondering what factory? If someone is asking about a Mercury branded motor made by Yamaha does the "factory" mean the Yamaha factory where it was made (Yamaha Service Manual) or does it mean Mercury who only sold the motor (Mercury Service Manual)?
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    2006 merc 40 4 stroke

    Is the engine serial number not known?
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    2006 merc 40 4 stroke

    What does a voltage regulator have to do with ignition?
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    50hp EFI diaphragm fuel pump pressure

    Where are you seeing a value of 19 psi? In a service manual or from an actual measurement?
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    Help with Engine ID / prop

    The motor did not come from Yamaha with a propeller installed. A boat builder, a Yamaha dealer or a previous owner selected and installed the propeller type (brand/model/diameter/pitch) that they felt was best at the time of installation. Different users want different results from a propeller...
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    1997 C40MLA 2 stroke 4 cylinder primer system?

    Can you provide the engine ID/serial number?
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    2003 Mercury 90HP 4 Stroke Grounds

    Yamaha Service Manual depicts the block being the ground point. For multiple components. One of which is the TPS. I can envision an intermittent ground causing all sorts of mayhem.
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    2003 Mercury 90HP 4 Stroke Grounds

    What is meant by FSM?
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    Vintage 4 hp Mariner

    Not doubting that at all. If the ID was known we can get to the year of manufacture and the applicable parts catalog and service manual.
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    Vintage 4 hp Mariner

    What are the numbers and letters that are on the ID tag? Does the ID start with 6E0?
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    Yamaha key switch mount horizontal

    One option would be to get two individual switch plate panels and transfer your components from the old single switch plate panel to the individual switch plate panels. Then mount the new switch plate panels side by side. Kill switch on what ever side is preferred.
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    2023 Yamaha 9.9 high thrust compression reading

    Minimum compression reading is stated as being 91 psi.
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    Yamaha rigging

    They make bulkhead fittings where the hydraulic hoses do not come out of the rigging tube opening.
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    Yamaha rigging

    It means I screwed up my post.
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    Yamaha rigging

    _-------++
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    Speedo Tube

    Gallagher? Is that you?
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    Yamaha 130 mounting height

    Is this deja vu all over again?
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    Speedo Tube

    Why do I keep reading about Yamahas with fly by wire? So confused
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    Speedo Tube

    Because GPS does not give one speed through the water. Depends upon what speed the user wants. No airplane will ever land using GPS speed.
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