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    Does yamaha have a prop that fit an alpha l genll outdrive?

    Generally, the modular props will fit most makes, with the correct hub kit and hub size. My V6 Johnson OB and V6 Mercury can share props, and that same prop will fit an Alpha 1 drive, with the correct modular hub. So if the Yamaha prop has a 4-3/4 hub, it should fit a MerCruiser Alpha 1.
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    Big motoe + tiny transom

    Is that a crack in the fiberglass in the corner of the transom? That is usually where the cracks start.
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    Year of Mariner 115?

    Maxrules has a model guide. All 4 cylinder 115HP motors have a letter prefix on the serial number. The older IL6 motors have numbers like yours.
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    Bottom paint

    My speedboat sits on a lift with bunks all season. It has one-part polyurethane topside paint on the entire boat, however, I never had even one blister. I think it is a non-issue.
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    Bottom paint

    Gee, Mike, I have never seen blistering on a trailered boat with bunks. Of course, a roller trailer eliminates that worry.
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    Bottom paint

    Antifouling paint on a trailered boat is not ideal, IMO. It will rob some speed, not look good and wrongly announce that the boat was kept in the water, which is bad for resale.
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    Water in my oil

    Look for the rating on the oil bottle. The Mercury oil you are using is very likely FC-W.
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    Bottom paint

    Yes, one part polyurethane paint is considered to be topside, but there are other topside paints which include enamel and other formulations. I believe polyurethane paint to be superior in shine and hardness to them. Their price is also higher.
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    No fuel. Mercury 115 2 stroke

    Gee, it sounds like the carbs are dirty. Cleaning and rebuilding is in order.
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    Bottom paint

    Trailered boats do not need any paint on their bottoms. The gel coat from the factory is just fine. If you do not like the look of the gel coat, any marine polyurethane will make it nice and shiny, with the correct prep. If you use a one-part polyurethane, the boat cannot be kept in the...
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    bent cable

    Gee, I do not see the bend. I did see some pictures of your shop, plus some others I cannot id. However, if there is a bend in the cable and the cable end will not pass thru the tilt tube, you need to cut it off and pull out the stub.
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    Using poly resin without glass

    Jim, there are two kinds of poly resin. Laminating resin (no wax) stays tacky after it sets. Finishing resin (with wax) gets rock hard. You can gelcoat over either, but sanding the finish resin is recommended. The gelcoat also comes in waxed and unwaxed. Unwaxed is used for the first coat...
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    Tachometer

    Sure, It is easy with a remote control engine and a dashboard. First buy a tachometer that is compatible with your engine. Install it into the dashboard. Second, most remote controls have pigtails or a plug that will supply +12VDC, ground and tach signal. Hook those the the tachometer...
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    Fuel tank lines mercruiser 3 litre lx

    Fittings are usually molded into plastic tanks. If they swivel in a bushing, they might be able to be drilled out, but if rigid in the tank wall, removal will likely damage the fuel tank. I am assuming the third small hose is for a fuel return from the injector rails.
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    Fuel tank lines mercruiser 3 litre lx

    Heater hose maybe, but not marine rated fuel lines to my untrained eye.
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    Using poly resin without glass

    Jim, you can think of poly resin w/o cloth as a good varnish. It will seal wood quite well. Of course like varnish, it will not bridge seams in the wood. So if you were to build a kayak of wood and seal it with poly resin, it would work fine, until the wood flexed and a joint opened a bit...
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    Fuel tank lines mercruiser 3 litre lx

    Antisiphon valve is in third picture, or at least that is a prime candidate, and where it is usually installed. Are those red hoses marine rated? They look like garden hose. You might look to see if they are still in good shape on the inside.
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    1993 fast strike 150 carb jets

    Worse comes to worse, see if you can buy used carbs, and transfer the jets over. There must be some junk motors like yours by now.
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    1993 fast strike 150 carb jets

    These guys have one https://www.seawaymarine.com/products/327558
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    1993 fast strike 150 carb jets

    Here it is... listed for a 2003 motor, but not a 1993 motor. They have one https://www.marineengine.com/newparts/part_details.php?pnum=OMC0327558
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