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    Seeking marine gauge recommendations

    The water pressure gauge can indicate the condition of the impeller. If pressure drops over time at the same RPM, it indicates the impeller is wearing out.
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    Epoxy question.

    All 2 part epoxy resin is waterproof. Water will only get in thru a defect in the coating. For items that flex, a layer of fiberglass cloth will help keep it waterproof. Epoxy needs protection from the sun. Most wood sealing can be done with polyester resin. It is fine for above waterline...
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    Installing trim gauge on old engine that has no gauge.

    If you found the sender, trace the wire to the boat harness. The wire may be white/tan. Your gauge would use switched DC power and ground plus the sender wire. You might purchase a trim gauge for your brand of motor, as the sending units may be unique to motor brand.
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    mercury 500 50hp ignition connection

    When you say ignition wire, which one(s) do you mean. On an ADI ignition like you probably have, there are wires from the stator to the switchbox to charge it. There are wires from the trigger to the switchbox to fire it and there are wires from the switchbox to the coils, to fire the coils...
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    mercury 500 50hp ignition connection

    You might find an wiring diagram for that motor. iBoats has some on this site. Maxrules site also has some. Normally the ignition wire would be grounded to kill the spark, and ungrounded to allow the motor to run. What is the rest of the engine wiring harness look like? usually they are bad...
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    Seeking marine gauge recommendations

    Obviously the simplest approach is to try to get a speedo that matches your tacho. Barring that, find a gauge style and brand that you like that has both gauges. I have never found any real difference between the brands. You might consider a water pressure gauge for your outboard. Those are...
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    Starter Issues on Mercury 115

    A lot of those starters are permanent magnet ones. If they are connected backward, they will spin backward and the bendix cannot engage. You should be able to turn the bendix up to engage the flywheel, before powering the starter with the start position on the ign key. If the bendix then goes...
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    1986 Mercury 75hp Mod.

    The Achilles heel is the cooling system and the carb condition. Both cause overheat and cylinder damage. Do change the waterpump impeller, wearplate and two gaskets every 3 years. if you suck up sand, change it right away. Clean the carbs and rebuild with new gaskets, inlet needle and seat...
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    Garmin power

    Good starting batteries will not drop below 8.5VDC when cranking the motor. If the voltage at the Garmin is below 8.5, either the battery is bad or the wiring has resistance causing a voltage drop.
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    Old mercury 350

    What year motor? Most Mercs from the 70s, 80s and 90s, have cable connections on the port side. The shift cable connects to the shifter slide, and the throttle cable connects to the S shaped throttle arm.
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    Blackmax 135 loss of speed

    High speed jets in carbs should be fixed. The only carb adjustments are for idle quality. You can examine the spark plugs after a high speed run for color. They should all be the same. if one is real black from fouling or real clean fro water intrusion, that could be the issue. Checking...
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    Boat carpet question.

    A lid is an old term for a cache of marijuana. Everyone knows that
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    Winterize boat

    Make sure the motor is stored gearcase down to allow all water to drain from the powerhead. Trickle charge the battery to keep it charged. Grease the steering and swivel and trim fittings. Before it gets cold, drain and refill the gearcase oil. if it is milky looking, it has water in it and...
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    60 DEGREE vapor seperator function?

    Those motors also have a vapor pump, and the vapor separator has a sealed cover and an inlet needle, and gravity feeds the OMS pump. I always thought that the vapor pump and the OMS pump team up to pull fuel from the tank. I never got a definitive answer on that though.
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    Johnson 115 v4 60 degree

    Calibration pockets are not adjustable. They do need to be cleaned though. Reed valves do not usually cause hesitation when accelerating. Check off idle orafices to make sure they are clean. Check gaskets on carb bases for leaks. Make sure you get the right carb kits. Some kits have the...
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    Boat carpet question.

    Jim, if your boat deck rots after you install a carpet, it is not the carpets fault. The boat deck should be rot proof, that is polyester resin and cloth over any wood. Now if you prefer some other deck covering, that is different.
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    Johnson 115 v4 60 degree

    2 stroke motor, right? If so, the throttle bodies plus the carb bodies perform all the functions of a traditional carburetor. The carb bodies have the floats and inlet needle, plus the high speed jet. The throttle bodies have the throttle plate, low speed jet and intermediate air orafice...
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    Derating a 5 hp ( ca, 1995 model) to 4 hp

    A new decal is the cheapest way. Alternatively, if the authorities are stupid, you could cross out the 5HP and write in 4HP with a marker.
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    Adding dash voltage gauge for trolling motor batteries.

    You are trying to measure hundredths of a volt. Make sure to get a real accurate volt gauge. Make sure to use marine quality, dedicated wiring from battery to gauge for both ground and voltage. make sure to solder all connections, and minimize the number of connections. A small amount of...
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    Trimming with Outdrives and Trim Tabs

    I only used the tabs in rough seas. Then it was outdrives down, and tabs down for a smooth ride. Maybe trim the drives for a bit more speed/efficiency. In smooth seas it was tabs up, and trim the drives for top speed/efficiency. Of course, I never had any listing issues.
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