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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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    9 amp to 16 amp stator overcharging

    Is the model of the motor not known?
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    Retrofitting a trim sender (2021 Yamaha F25LC)

    Have you looked at all of the various 2021 Yamaha F25 models at the Yamaha website to see if one of them has a trim sender installed?
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    Mercury 60HP 2 Stroke 75HP Stator swap?

    Yes.
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    Honda/Tohatsu and lithium battery

    Can I get a show of hands from those that are using a lithium starting battery with your Honda or Tohatsu please? Thanks much.
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    Yams/Suzukis and Lithiums

    Can I get a show of hands from those that are using a lithium starting battery with their Yamaha or Suzuki please? Model of the motor would also be appreciated. Thanks.
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    01' Yamaha 6hp 4 stroke compression?

    Yamaha does not give a range.
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    Yamaha 200 hpdi timing issues

    Not correct. RPM reduction mode is based on low oil in the main engine mounted oil tank or an over temperature event.
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    Yamaha 200 hpdi timing issues

    Are you trouble shooting without an understanding as to how the motor functions?
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    Yamaha 200 hpdi timing issues

    If the shift position switch tells the ECU that the motor is in neutral then certain cylinders are deactivated based on motor RPM. Until you fix the pulser code problem you are wasting your time.
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    Yamaha 200 hpdi timing issues

    If a code is set the ignition timing is set to a fixed value.
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    Yamaha 200 hpdi timing issues

    First think to know is that if the code for the pulser coil is being set it does not mean that the pulser coil is bad. It means that the ECU is not getting good data with respect to the pulser coil. Could be wiring to the pulser coil or wiring from the pulser coil.
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    Power Trim

    Or disconnect the terminals from the relay. Apply battery power directly to the blue wire and the green wire. See if the T&T unit functions normally.
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    charging help

    You missed the part where the battery is a core component of the motor's electrical system. Fuel pumps and injectors (at a minimum) need battery voltage to function. For what reason was the battery disconnected?
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    slight gas in oil 2009 yamaha 4 stroke

    A 2009 F150 has a red line RPM of 6000. You are over propped.
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    slight gas in oil 2009 yamaha 4 stroke

    You and other users of Mercury Marine, Suzuki, Yamaha, Honda, Tohatsu and Johnson four strokes have suffered from gasoline in the oil. Known as the engine "making oil". There is nothing for Yamaha to defend. It is a characteristic of four stroke motors. There are a number of events singularly...
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    slight gas in oil 2009 yamaha 4 stroke

    Run the motor at wide open throttle (WOT) with the boat loaded. Engine trimmed up just to the point of best boat speed and no further. What is the WOT RPM?
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    slight gas in oil 2009 yamaha 4 stroke

    That is one possibility.
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