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    Yamaha 150hp 2-stroke low fuel pressure

    The VST has a drain fitting. Open the drain. Pump the primer bulb. Fuel should flow from the drain. After ensuring the VST is full of fuel, you can apply battery positive and negative directly to the wires to the high pressure fuel pump. You should then have rated fuel pressure. If not, either...
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    200 hp Saltwaterseries lift motor engaging on its own.

    Many folks that replace parts without knowing for sure that the part in the problem have a surplus of unneeded spare parts. Yamaha will appreciate your business.
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    Power trim Wire, 2 or 3?

    Not ground wires but many models and brands use a bonding wire.
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    Power trim Wire, 2 or 3?

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    200 hp Saltwaterseries lift motor engaging on its own.

    You can simply disconnect the engine switch to see if the problem goes away.
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    200 hp Saltwaterseries lift motor engaging on its own.

    Need to know the complete model identity to be sure of getting to the right part number switch.
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    Power trim Wire, 2 or 3?

    I am guessing that it is the wiring for the trim sender.
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    Power trim Wire, 2 or 3?

    SM shows two wires to the trim and tilt pump motor. Blue for up and green for down. Mercury parts catalog only shows two wires to the pump motor.
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    Whats this part???

    An airline pilot will never ever use GPS speed when taking off or landing. He will use the old style pitot tube system. Fancified with electronics to make it more accurate. Speed through the air (like speed through water to some) is much more important.
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    Whats this part???

    They do. While failing to understand the difference between speed through the water and speed between two points in space. Across ground if you will.
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    2016 Yamaha F300 gear oil smell when running

    I am not understanding 2 quarts of oil being required.
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    I need help with this 5hp mariner Yamaha

    What is the complete model or engine ID?
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    Identification help

    You might have some luck looking for a carburetor under a Yamaha part number. Circa 1983 two cylinder Yamaha. https://www.ebay.com/itm/196268922839?_skw=Yamaha+25hp+2+Stroke+Carburetor+6h7-14301-72-00&itmmeta=01JBMZJ4HDMCKNKVBVK0SDFJ2N&hash=item2db28a17d7:g:EOgAAOSwrM9l31ev
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    2 flat & wavy washers along with plastic washer not under impeller cover ?

    Agree that the missing washers have nothing to do with the shift mechanism. But they should be installed IMO. Using a pair of padded pliers on the shift cam assembly you should be able to turn the shaft as far as it will go in both directions. Noting the position of the shaft in each direction...
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    Electrical Diagram

    Should be inside your service manual.
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    Yamaha F300 Cylinder Head Pressure Testing

    I think he is looking for a plate so that the cylinder head can be pressurized so as to find a leak.
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    Yamaha 8 HP 4 stroke oil collection in cowling, housing

    They make dyes that can be added to the oil to help make leaks more visible.
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    Voltage rectifier

    I have had good luck using aftermarket rectifiers and rectifier/regulators.
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    What size socket wrench fits my spark plugs?

    Thin wall socket.
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    Why o' why?

    Is this a 50 two stroke or an F50 four stroke? You imply that it is a two stroke but it sounds like a four stroke.
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