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    WMK-22 question 76 Merc 1500

    I do not think the carbs are different, however, Merc has a habit of installing different jets in different carbs on their V6 models. I never checked the jet size on my Merc 1500. It is starting to sound like the PO had some carb issues, and a unique way to try and resolve them. Getting the...
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    make remote start and add key switch

    Gee, Seloc service manuals often have mistakes in them, but leaving out a starter solenoid is a whopper. Clymers are pretty bad as well.
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    wiring

    Gee, is there a question?
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    1975 Mercury 500EL Lightning Energizer wiring…

    The white wire is ign power. If it unused on the later ADI ignitions, and maybe unused in your motor as well. Merc likely wanted the boat harnesses to be universal, so you could easily replace the motor with a larger or newer one, w/o changing the boat harness or control, It is a guess, but a...
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    WMK-22 question 76 Merc 1500

    I had that engine, and never saw bb's on top of the idle restrictor tube. I would believe the part diagrams on crowleymarine. If they do not show it, it likely shouldn't be there. Maybe they were trying to fix some idle issue?
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    WMK-22 question 76 Merc 1500

    Are you talking about the idle restrictor tube? That is removed after the plug on top. Both are brass, and screw in at an angle. Your '76 should have the backdrag carbs with the rubber tube from carb bowl cover to throat. Sometimes people like to plug those with bbs to disable the backdrag...
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    hull repair needed along lower rake

    I would be concerned for the strength of that repair, because originally the entire hull was cured at one time (or should have been), and your repair will be thinner than the original, with shorter strands of glass. It would best to put some heavy roving on the inside of the hull, and cloth on...
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    Fuel question(s)

    Smell the fuel. If it smells fresh you can run it. Gasohol is fine to use in all motors. If the fuel is premix, and you know what oil was used, mix up some fresh stuff and compare the color to see if significant evaporation of the gasoline component has occurred.
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    1992 mariner 150hp

    The Procraft looks to be a bass boat type. The Mariner would usually have a 2::1 gear ratio. You would normally run a 19 or 21 pitch, 3 blade prop. I would think a 23P prop would be too tall.
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    Which motor should buy?

    Gee, those prices seem pretty high for 60+ and 40+ year old motors.
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    2020 Mercury 150 4 Stk/Steering Feels Stiff. Where Are the Grease Point Located?

    I think the picture has it correct. Tilt the motor up to lighten the pressure on the top bushing. Wiggle the motor steering while tigntening the strap. Some heat might help soften the old grease. If that all fails, you could drop the trailer tongue, put some sort of block under the anti...
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    No power to ignition switch

    Just a note on those cheap multimeters. I had one and it could not tell the difference between a 400 ohm resistance and a dead short. I had to give it the float test.... Just saying....
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    Part Identification for Mercury Outboard

    You may need to see a dealer. You can tease him if he cannot find it either.
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    Part Identification for Mercury Outboard

    Does crowleymarine show it on their diagrams?
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    2020 Mercury 150 4 Stk/Steering Feels Stiff. Where Are the Grease Point Located?

    You want fresh grease to come out both the top bushing and the bottom bushing. I had that issue on my '93 Merc. I expect the PO never greased it. I had some success fixing it. Pump enough grease into the fitting for new grease to emerge from the bottom. Now you want to open up the space...
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    1978 Mercury 50HP Throttle and Shift cables

    yes
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    1978 Mercury 50HP Throttle and Shift cables

    Mercury Control cables have not changed in a lot of years. Teleflex 600A cables should be correct.
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    Compression too high?

    Iboats has some powerhead rebuilders. You might check prices on their rebuilds. IME they go thru them pretty good, so you don't have bad blocks.
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    Plastic where zinc goes.

    If you trailer your boat after each use, most of what I posted is unnecessary. Anodes will last years, or forever. No antifouling paint is required. Paint on the outdrive is simply for ascetic purposes. Flushing the running engine with freshwater is a real good idea. Hose off the block...
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    Freshwater Dry Joint Manifold

    Slide the rubber tubes off the risers and look at the exhaust tube and water passages. These usually rust out first and is obvious upon inspection. If they are rotted out, you need to check the manifolds, as described in post #2
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