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    Question on Yamaha electrical connectors

    They are not Yamaha specific. Try a Yamaha motorcycle shop or https://www.easternbeaver.com/connectors/
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    1994 yamaha 250 outboard..txrs

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    '02 Merc 4 Stroke - Diagnosing bad ECU?

    If it is of any consolation you are not the first to throw parts at a problem and you certainly won't be the last one. Modern self diagnostic equipment can make the problem worse. Folks get a code, say one relayed to sensor X, and then buy and replace sensor X. Sensor X was not the problem.
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    Fuel Pump for 1997 9.9 mercury four stroke

    Here is what an AI search just turned up. I am not seeing anything incorrect in what has been written. Seems to all be good advice. What is there that is not correct? photo url uploader
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    Fuel Pump for 1997 9.9 mercury four stroke

    What did/does AI have to do with this thread?
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    Fuel Pump for 1997 9.9 mercury four stroke

    See below. Yamaha part number is now 99999-03273-00.
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    Fuel Pump for 1997 9.9 mercury four stroke

    https://jlmmarine.com/products/fuel-pump-assembly-for-mercury-mariner-8hp-9-9hp-13-5hp-15hp-4-stroke-models-825470-835389a2-835389t1-835389t02?srsltid=AfmBOoplYi6WDy6PQATZg4VOfx3IPYd286yZzk5lY8g95EkfnjC4MGl3
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    Fuel Pump for 1997 9.9 mercury four stroke

    What is the engine ID? Serial number. Not much can be done with the engine identification missing.
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    '02 Merc 4 Stroke - Diagnosing bad ECU?

    Do you see any markings on the CDI box? If so, what are they? If a Yamaha box is installed, the output of the CDI to the ignition coils can (should be) be tested. As shown below. If the CDI output is normal then perhaps it is the ignition leads. If below normal then test for the inputs to the CDI.
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    '02 Merc 4 Stroke - Diagnosing bad ECU?

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    '02 Merc 4 Stroke - Diagnosing bad ECU?

    75 or 90 HP model? The Yamaha F75 and F90's of that vintage did not have an ECU. A CDI assembly was used. Capacitor discharge ignition system.
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    Yamaha 150 Rigging Tube

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    Yamaha 150 Rigging Tube

    Is the model of the motor not known?
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    What year is my mariner

    Nothing to do with the best place to buy parts but for the Mariner you might have better luck buying Yamaha branded parts. More than likely that Mariner branded parts won't be readily available.
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    What year is my mariner

    1983
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    Yamaha vf115 ran fine first day, second day stopped and won't start

    I am not suggesting that the switch be replaced. The switch may be just fine. I am suggesting trouble shooting and then doing whatever needs to be done to clear up the code 28 for the incorrect position switch fault. Then see if the throttle opening message goes away or not.
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    Yamaha vf115 ran fine first day, second day stopped and won't start

    Why not fix the incorrect shift switch signal before anything else is done?
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    Suzuki df9.9a lower unit interchange chart.

    Look at the parts catalogs to see which years used your part number lower unit. Any lower units with that part number will be interchangeable. Likely that any later part numbers that were installed on a DF9.9 will also fit.
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    2023 Suzuki DF115B spark plugs

    The spark plug stated in your owner's manual would be a wise choice.
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    Yamaha 130 v4 trim removal

    In most Yams there is.
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