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    Merc 115 4 strokes 2001 ECU/fuel pump problem

    OP's motor is of Yamaha origin I believe. Power comes from the ECU for the injectors and a couple of other components. Or it is supposed to anyway.
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    Merc 115 4 strokes 2001 ECU/fuel pump problem

    Of course it is possible to power the fuel injectors (and other components) that normally get their power via the ECU. Using a simple relay as you suggest. One word of caution is that you would want the relay control circuit to deactivate the relay power circuit at any time that the motor...
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    question on Yamaha ELG 40 carb rebuild

    I don't think the rotational orientation matters. The Yamaha service manual says nothing about how it is to be inserted into the carburetor.
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    Bent prop shaft

    Propeller shafts are bent all of the time without suffering other damage. Suspect yours is the same. Straighten the shaft or buy new. Boat on.
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    2002 Mercury 115 ELPTO 2 Stroke electrical output

    My 1997 175 EFI Mercury came with a pull cord in the pouch. Battery only needed to have enough voltage to run the fuel pump. Like you, I tried it. Surprisingly easy. Motor started right up. Never needed to use the cord again.
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    2002 Mercury 115 ELPTO 2 Stroke electrical output

    I would guess that your motor has pull start capability. If so, no harm no foul if the start battery goes dead. Having said that, I see no problem in having two batteries. One for start and one for the house. With a VSR/ACR/Combiner/Isolator/Etc. between the two. The alternator on your model...
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    2002 Mercury 115 ELPTO 2 Stroke electrical output

    Folks don't like to tell folks what motor they have.
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    2002 Mercury 115 ELPTO 2 Stroke electrical output

    A Mercury two stroke with an RPM of 6000?
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    2002 Mercury 115 ELPTO 2 Stroke electrical output

    Why the missing serial number digits?
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    2002 Mercury 115 ELPTO 2 Stroke electrical output

    Low? That is pathetic.
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    2002 Mercury 115 ELPTO 2 Stroke electrical output

    Many folks have their Mercury motor starting batteries connected to a house battery via a VSR/ACR/Combiner/Etc with no ill effects so that the alternator charges each battery according to its own needs. Some Mercury models use two voltage regulators where one charges the start battery and the...
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    Mercury 60 HP Differences

    Four strokes have been replacing two strokes over time for quite a while now. Less polluting. EFI models have been replacing carburetted models over time. Less polluting. Less problematic. Use the link above to get to what Mercury has offered over the years. Why does it matter?
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    Mercury 60 HP Differences

    https://www.jdpower.com/boats/2008/mercury/outboard-motors
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    1994 250 2 stoke yamaha

    Normal from the carburetors perhaps. Not normal from the air intake silencer.
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    Prop Shaft "mid bearing" part number help

    Sounds like an LF gear case being shifted and run in reverse so as to go forward with a right turn propeller.
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    1994 250 2 stoke yamaha

    You know the mix ratio is correct by confirming that the oil pump link rod is set correctly. According to what the service manual says. When the motor is tilted up the inlets to the carburetors is facing downward. Any fuel oil mix that is in the carburetors can drip downward.
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    Prop Shaft "mid bearing" part number help

    Look at the gear case housing for whatever markings you can find. What are you seeing?
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    Prop Shaft "mid bearing" part number help

    All I think is that the propeller shaft picture in the OP's post looks more like an LF225TURC propeller shaft than it looks like an F225TURC propeller shaft. Not unheard of for an LF225 gear case to be installed on an F225 motor. Or vice versa.
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    Prop Shaft "mid bearing" part number help

    The propeller shaft shown in your photograph looks to be that for an LF225TURC.
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    Help identifying thus Mercury 5hp

    Go to the Mercury Marine parts catalogs. Type in the engine ID. It will take you to the motor. https://public-mercurymarine.sysonline.com/Default.aspx?sysname=NorthAmerica&company=Guest&NA_KEY=NA_KEY_VALUE&langIF=eng&langDB=eng
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