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    Cushion and Seat Rebuild

    Just seal the plywood well with one of the coatings recommended. It will last the length of the vinyl's life. My '98 Seaswirl has some kind of 1/4 plastic for the bow backrest cushions. You can staple to it, and it lasts forever, but is not structural. The structural components are plywood.
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    Steering system .Order new cables or new system.

    I have never compared the rotary to the rack. I do have one of each with the same HP, but on very different boats. I expect one style to fit better in the boat dashboard than the other. Well, my 21' Seaswirl with the 150 Ocean Runner, is rated for 200HP. It had the one cable NFB Rotary...
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    2005 115 Johnson PLSOR dies off idle

    Those motors tend to do that. Some think it is heat soak. The work around is to run them at high idle in neutral until they start to run clean. They should then behave normally, until you shut them off, and restart them after 30 minutes.. You might test your thermostats. I have a theory...
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    Steering system .Order new cables or new system.

    I run a single cable NFB on my 21 footer with a 150HP Ocean runner. I would think that Merc 200 would work as well. Is that Merc a 2.0L motor? If so, you might consider the Evinrude as it is a 2.5L motor which I would think will have more bottom end.
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    Cushion and Seat Rebuild

    Use dry PT plywood and cover it with spar urethane or polyester resin. Stainless steel screws and Stainless steel staples as well.
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    1963 johnson 40 hp electric

    Gee, those coils were made in West Germany. So they are pre 1991! That point base also looks real rusty.
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    Stand-alone tilt/trim pump

    Brian, the test is to pull up on the motor with your hand. If she moves, you need to bleed the rams.
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    Steady Buzzer Sound

    Something else I thought of. If you pull the main plug the buzzer may stop, since it is disconnected. In that case, you will need to look for voltage on the accessory/ign wire at the engine plug. I would expect the wire to be purple.
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    Tach for Merc outboard

    It very likely does. The tachometer takes black, purple and grey wires. You will need the adaptor that brakes out the 4 wire plug. I bought one last year, but cannot remember it's part number. It took a bit of doing to get the P/N from Mercury, but I think amazon had the cable. Check on...
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    1974 Merc 1500 Telltale issue

    Those exhaust tubes are tricky to get them in correctly, as the seals can bend and clog the tubes. Drop the lower unit and put a garden hose on the water tube and turn on the water a very small amount. Now water should come out the prop, gratings above the A-V plate and telltale. If not, the...
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    Steady Buzzer Sound

    Those Mercruisers have a single plug that connects the boat to the engine. If the wiring on that is not the issue, and you installed the ign switch correctly (3 wires, power, starter solenoid, accessory/ign), I am not sure what could cause it. If you disconnect it and the alarm still sounds...
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    Water in oil

    The gasket surface on those manifolds does not look good. Usually the risers are worse. You can try to sand them down (heavy emery paper on plate glass), and see if they can be trued up. They are not very rusty, which is good. How old are they?
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    1974 Merc 1500 Telltale issue

    Your TOP will run fine on standard flusher devices. That is not the issue. The possible issues are that you forgot the drive key in the impeller, the water intakes are clogged with dirt/barnacles/insects, the water tube pulled out of the exhaust extension, or the water tube is damaged. You...
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    Steady Buzzer Sound

    Those MerCruiser warning systems detect overheat and no oil pressure. Hence, the oil pressure switch is supposed to turn the alarm off, when it opens due to oil pressure. If your boat has a oil pressure gauge, then it will have two oil pressure sensors. They do not last forever. The one for...
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    Grinding Noise

    The thrust washer goes between the prop and gearcase. You must have one that is correct for the new prop. Sometimes the thrust washers for different props are not interchangeable.
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    Water in oil

    A bad manifold-to-riser joint will allow water into the exhaust ports. If your manifolds and risers are older, you may need to inspect the mating surfaces and clean and lap them. MerCruiser had some nice silver gaskets. They worked better than the green paper ones.
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    New to the forum, looking for help.

    Carb opening is usually synched with a particular spark advance. Has this been checked? Normally at about 1200RPM, the fuel for the engine transitions from the idle jet to the main jet. Is this where the roughness occurs? If so, the idle mixture could be a bit lean.
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    10mm fuel hose or 3/8"? 1995 Tracker ProV17 90 HP Mariner 2 stroke

    A 90HP motor will run fine on 5/16 fuel line, so the diameter is not the issue. You do want the fuel line to match the fittings.
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    Bottom Paint Recommendation

    I have not use it, but Interlux Perfection is a 2 part polyurethane that claims to be able to be used below the waterline. I have used Interlux Brightside, which is a 1 part topside polyurethane, and it is very good, but pricey.
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    Trim question for the new 150 HP SeaPro Outboard.

    What does the owners manual say? Most motors do have a trim limit.
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