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    Nissan or Mercury?

    Gee, even large 25 year old 2 cycle outboards do not foul plugs anymore. My '98 Johnny 150HPV6 (2 cycle oil injection) will troll all day w/o issue. Not sure what the issue is with your Honda.
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    Fuel water separator and fuel filter on 3L

    You realize that water separators work by gravity, right? Fuel and water goes in the top of the separator, and the water settles to the bottom, as fuel is drawn from the top of the separator. The filter element does nothing to separate the water from the fuel. A water separator with no...
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    Merc 75 4 cylinders, 2 carbs

    Most Mercs have a piece of plastic that flips to release the throttle cable. The idle stop set screw is usually on the bottom of the throttle arm. You usually back it off to lower the idle and adjust the barrel on the throttle cable to push the throttle closed.
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    Boat floor

    The plywood will be sealed on all sides with poly resin, right? Why not overlap the seam with the vinyl? It will give a smooth look, if the seam is smooth.
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    Crack in cylinder wall, need insight....

    Gee, I vote for welding it from the outside. Also, the crack was likely from overheat, so you must make sure that does not happen again. There are no ridges in the bore, right? Causes of overheat are lean fuel/air mix, water pump issues, thermostat issues, over advanced timing and poor fuel...
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    Merc 75 4 cylinders, 2 carbs

    The idle speed is controlled by the idle stop screw, on the throttle arm. Of course, the throttle cable pushes against the idle stop screw. So turn the idle stop screw to lower the idle speed. It will push against the throttle cable. If the push is too much, turn the barrel nut on the...
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    yamaha 2013 waverunner

    I believe those models have a self check like an auto OBD-II system. You hold the button on the bottom left of the dashboard down until the code appears. Hopefully the code is listed on the internet. Remember those WR motors have most of the components of a modern auto, like crank angle...
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    LU 1655-7332 Parts Diagram?

    Gee, so you are looking for a gearcase with bad gears? I would not expect them to be hard to find. I had one I tossed out, 20 years ago.
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    Mariner 45hp Carburetor Leaking after Total Rebuild....stumped!

    was it possible to use a drill the same size as the inlet needle to drill the seat a bit more, eliminating the defect?
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    Bought wrong prop

    The spline length and position on the Merc and OMC are different. The splines should be the same size. The merc prop should fit on the OMC, but not go on all the way. I used a Mercrusier prop on my Johnnyrude outboard. I needed to drill out the splines nearest the inside of the prop to make...
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    Merc 75 4 cylinders, 2 carbs

    The only real synch necessary is to make sure the carbs open at the same time. There are adjustments on the bottom carb where the plastic linkage attaches. Set the throttle so the top carb to ready to open, but still closed, and then loosen the linkage on the bottom carb and set it the same...
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    LU 1655-7332 Parts Diagram?

    Shims go behind the gears to achieve correct tooth mesh. Too little will strip the gears, too much mesh will cause breakage of gears. Take a look at the crowleymarine site. Gearcases from IL 4/6 motors 1973 up to and including a'77 Merc inline 4/6 will fit your motor. Likely others will too...
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    Enrichner valve

    Of course, you could test it the old-fashioned way. Use a piece of wire to jumper from the positive battery cable on the starter solenoid to the enrichener connection. That will ensure the enrichener is getting +12VDC. If she doesn't work when you do that, either the enrichen is bad or the...
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    2 stroke randomly does not want to start + house battery voltage seems low

    Mercs usually have preload on the throttle cable to help you find neutral. To do that, adjust the throttle cable at the engine, in neutral, to push the throttle closed a bit more to add the preload.
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    Enrichner valve

    It could be a short in the enrichener coil, pulling down the voltage. I do not know if that circuit has a fuse. Pull the wire off the enrichener and test the voltage again. Also, perform a resistance test on the enrichener body to ground. Resistance should be zero. I have never had an...
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    fuel problem

    When a 2 cycle outboard leaks fuel out of the exhaust, it can be caused by a leaking fuel pump diaphragm.
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    1976 mercury 1150 115hp runs on muffs but not in lake

    You need to have +12VDC on the red and adjacent white wires to have spark. The red wire is "hot" all the time, and the white wire is powered by the ign switch. There is a test on CDI electronics web page that will test all of your ign components but the trigger. You need to pass that test...
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    1976 mercury 1150 115hp runs on muffs but not in lake

    Triggers and distributor housings were $225 the last I looked some years ago. I think CDI Electronics made them, but Sierra is also a possibility.
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    50 hp high speed misfire

    I doubt that is your issue, however, as was said, it is easy to check/clean. But, hey let's be optimistic.
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    1976 mercury 1150 115hp runs on muffs but not in lake

    In your spare time, you might source a new trigger and distributor housing, for the day your trigger becomes intermittent. Just to see if they can still be gotten easily. At this time in it's life, (nearly 50 years old), they tend to start to fail.
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