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    Tach non working on Mercury classic 50

    Most Mercury rectifiers are bridge rectifiers. That is one diode can be bad and the system will still charge the battery at half current. A bad diode can also not provide the tach signal. You might connect the tach wire to the other AC terminal of the rectifier and see if it then works.
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    I want to add a 2nd killswitch to my 1996 Johnson 50

    Ign switches should never fail that often. You have some other problem.
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    Regular fuel

    Almost all engines are rated for regular fuel. Fuel sitting for 2 weeks is not an issue with any grade of gasoline.
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    portable jump starter.

    You mean a jump pack? I never believed in them. They are simply a newer battery than you have now. What happens when you replace the battery in the boat? Do you replace the jump pack, or let it get old? Batteries wear out even if not used. I consider a jump pack as a back up to your old...
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    11 wires?

    Sounds like a "custom" wiring job. You may be able to pair like colored wires, but who knows what the installer did. Even if you used two complete harnesses, that would only be 10 wires. It would be best to trace each wire. For 11 wires, I expect some to be unused, since you would only need...
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    1995 Mercury 115hp. Wot bog

    It may be a fuel restriction. See if pumping the primer at WOT fixes it. If so, look for air leaks in the fuel line, dirty filters, clogged antisiphon valves or a clogged fuel tank vent. That motor should have a 5/16" fuel line. Smaller will starve it.
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    1968 Glastron Transom question

    You can apply fiberglass cloth and resin directly to the wood, and make the repair. I am surprised that the wood is in good shape, but if it is, definitely make the repair before it gets wet. Grind the edges of the remaining fiberglass to feather them. Cut the first piece of new cloth to...
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    Mercury Switch

    Boscoe, Mercury OBs from the 70s had a battery driven CDI system, utilizing a Hall-effect trigger. This system pulsed the single coil with high voltage from the capacitor, to induce spark, and had a mechanical distributor. It was different than the battery/coil/points system you describe...
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    Stringer replacement

    3/4 CSM is a bit light. I like the 1.5oz mat for structural stuff. Use 2-4 layers of 3/4 CSM for strength on stringers. 3/4 CSM is good for waterproofing the decking.
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    Mercury Switch

    CDI is a name for capacitive discharge ignition. The power for CDI can come from the battery or from the alternator. In your case the power will come from the alternator, hence the name ADI ( alternator Driven Ignition). Hopefully the switchbox is bad.
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    What is this wire for?

    Tan is usually an overheat wire.
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    Mercury Switch

    Your motor will have an ADI ignition. The stator supplies all the power to the switchbox. So if the engine is not running, there should be no power to the switchbox. Also, the switchbox will pulse the coils to fire them. You will not see continuous voltage on the coils. Mercury switches...
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    1968 Glastron Transom question

    Gee, I would remove the engine mounting bolts and sand the area down. if you hit solid fiberglass w/o the cracks, those cracks are superficial. Then brush the sanded area with polyester resin and lay some 10 oz fiberglass cloth over it. Build it back up in thickness to original or thicker...
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    Stringer replacement

    I agree, fresh fiberglass is essential for the stringer to adhere well. Also, you must fill any voids in the mating surface of the stringer. That means using thickened resin, putty or something like those. Slather that stuff on the fiberglass and push the wood into it. Clamps, screws and...
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    Are Impellers Unique?

    Sears used to sell replacement parts for all kinds of their stuff. Much more than I thought reasonable. That inventory had to go somewhere, maybe flea bay? If you could get a part number, maybe you could find one.
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    Anyone Seen these?

    I always like to assign a value to an item. Lets say a $5K woman's purse. It still carries stuff like a cheaper brand. So where is it's added value? It is the snobbery that comes with the cost of it, so you are paying a premium to show that you paid a premium? That makes no sense to me...
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    What brand of 2 stroke oil do you use for your Johnson Evinrude 2 stroke

    I saw a test of 4 cycle oils. One of the tests was for evaporation of oil. The oils were heated to 300*F (If I remember correctly). The synthetic oils did not evaporate as much as the dino oil. Not sure how that applies to 2 cycle oil.
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    Anyone Seen these?

    Scott, you miss the point. A new top of the line conventional SS prop is say $550. The prop of discussion is nearly 10X that. So would you consider an $800K outboard over an $80K outboard, if it was twice as efficient on fuel?
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    Bearing grease / water leaked out on rim

    If you have friction on the bearing or brakes on the trailer, they will cause heat which expands the grease and pops the cover. Water would not do that, but water damage to the bearings can cause friction and heat. I would check the wheel for any friction or play, as it is now. The wheel...
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    Mercury 175 wont shift

    Put some good marine grease on the bushing, after it is cleaned out. Hopefully you do not have the pull the shift rod out, as that usually requires you to pull the powerhead.
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