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    Old yamaha mariner 40 hp to 50hp conversion

    Using the parts catalogs, compare the parts used on one model with the parts used on the other model. That will tell you the differences.
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    Yamaha F30Tlrd cylinder head torque specs and tightening sequence

    Page 5-25 of your service manual provides the information that you are seeking. If you don't have the SM, it is LIT-18616-F3-00. www.yamahapubs.com
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    Yamaha 30 SG carb emulsion tube

    It is from the Yamaha parts catalog from Yamaha USA's website. www.yamahaoutboards.com
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    Yamaha 30 SG carb emulsion tube

    You are in luck. The part is still available from Yamaha. However, I would first contact www.jetsrus.com to see if they have them at a much better price.
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    Yamaha 90sho, 2019, oil alarm on. Very low hours.

    When you say that the motor does not start, are you saying that it cranks normally but just does not start up? Or is the situation that it is not cranking?
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    Yamaha 90sho, 2019, oil alarm on. Very low hours.

    What are you seeing that is telling you that it is the low oil alarm? Is it a Yamaha tachometer?
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    Disable oil level sensor 2001 yamaha 50 hp

    It's not.
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    Rectifier/Regulator

    I am looking for something that depicts the regulation of the voltage. This is a Yamaha diagram. Looking for something equivalent from Mercury.
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    Rectifier/Regulator

    Does anyone have an electrical diagram that shows how a typical Mercury R/R works? Say for a 150 carb'd two smoke model.
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    Remote throttle/shifter + steering for 15HP tiller steer

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    Yamaha F100 TLRY - 2 lower units but only one shaft fits?

    It is an installation error.
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    looking for control wiring info

    The illustration shows a fused wire harness between the control box and the instruments. Part number 6Y5-83553-M0. The fused harness powers and grounds all of the instruments. Of which there can be many. As well as providing the frequency signal to a tachometer.
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    looking for control wiring info

    The red wire is within the Yamaha seven pin or ten pin main engine harness. Red wire gets battery power at the motor. Conveys power to the Yamaha key switch.
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    looking for control wiring info

    Red is the wire color that conveys battery voltage to the key switch. With the key on, the yellow wire provides battery power to the instruments. The green wire is the tachometer signal. The black wire is the ground.
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    Yamaha F100 TLRY - 2 lower units but only one shaft fits?

    I am seeing the exact same part number for a 2003 F75 and and 2000 F100. I have always swapped the gear case on the larger Yamaha motors with the motor in neutral. But I don't think that is your problem.
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    over heat alarm 150 hp Yamaha 4 stroke 2006

    There is no RPM limiter alarm on any Yamaha outboard motor. OP's motor alarms for either over temperature or low oil pressure. A steady horn. A beep beep beep tone will indicate for the presence of water in the water separating fuel filter but only when the motor is in neutral.
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    1994 Mariner 60hp

    Few want to say. Seems to be Top Secret information.
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    704 Binnacle Control Trim Not Working

    I agree with you. Equivalent to a 1984 model year 200ETXN.
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    704 Binnacle Control Trim Not Working

    Give me the complete engine ID and I can tell you the US equivalent model.
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    704 Binnacle Control Trim Not Working

    By the way, what is the model of your motor? Is the year of the motor more or less the year of the boat?
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