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    Merc 1150 bad cyl?

    If the cylinders that have water in them are #5 and #6, the lower crankshaft seals are likely bad. That is an easier repair. Simply loosen the crankcase bolts on the very bottom, and remove the end cap bolts and endcap. Replace the seals (3 is better than 2), and inspect the bearing for wear.
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    1984 75hp L4 with unique problem? I'm baffled!

    I doubt it is a plugged exhaust. What do the spark plugs look like? Any of them real clean? If so, you could have water intrusion, which puts out the fire in a cylinder or two. Running on muffs means nothing. She will rev up on the flusher and sound real good. What kind of boat and prop...
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    Shifting problems

    Motor idling too fast makes shifting difficult. I would expect idle speed in neutral to be 900RPM or less.
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    1984 75hp L4 with unique problem? I'm baffled!

    It sounds like your idle jets are set too lean. Set 'em to 1-1/2 turns open and she should idle in the water. Now on the water in gear, motor warm, adjust the idle mixture screws such that the motor will rev up. If she bogs, open the idle mixture screws one at a time, 1/8 turn and try again...
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    Merc 1150 bad cyl?

    I just disassemble the carb and blow out the carbs with some spray carb cleaner. Make sure to get the small holes just inside the throttle plate in the carb throat. Those are the idle circuit. I would not expect any significant loss of performance. 90 PSI is pretty good. On your '77 1150...
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    Merc 1150 bad cyl?

    Gee, it is a 1975 that he picked up for ignition parts. It is nearly 50 years old. Why should he rebuild it? I say run it, if you need to.....
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    Merc 1150 bad cyl?

    90PSi is pretty good for a damaged cylinder, as they are usually zero compression when damaged. Pull the middle transfer cover and take a look at the piston and cylinder walls. I would run it until the compression reaches zero, if that ever occurs. First, clean the carbs, rebuild the...
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    Looking for pump to drain oil through dipstick tube

    So, you are saying that some cannot be trusted not to strip a drainplug, so that all should be afraid to pull the drain plug? Gee, those drain plugs are made to be removed. if they strip easily, the design is bad, no?
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    Mariner 80hp 1983

    When you reinstall flexplate, make sure it is in the correct position, or it will screw up your ignition. It is easy to do, simply set the #1 piston to TDC, using a screwdriver thru the plug hole. Turn the flexplate until the decals indicate TDC, line up the nearest hole and install the bolts...
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    Looking for pump to drain oil through dipstick tube

    Gee, on those Yammies, isn't there an external rubber drain tube? My neighbors' 150 has one. Makes draining oil pretty easy. Why would you want an oily pump cluttering up the workshop?
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    Mercury 60 Hp 2 Stroke

    Check the throttle linkages. Make sure the carbs open. make sure the spark plug wires on on properly. You may want to take it back to the mechanic, who seemed to mess it up, and find out exactly what he did.
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    Mariner 80hp 1983

    There is usually a nut in the center of the inner flywheel. Once that is removed, Mercury uses a standard fitting that screws into the large threads around the but, and a bolt thru the fitting. Tighten the bolt and hold the fitting ith a wrench, and the inner flywheel will pop off...
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    SAFETY ALERT: Bow Seating Hazard (Malibu)

    My SeaSwirl 21 DC has seating for 3 adults in the bow. However, if you put two adults in the bow, very occasionally when you hit a wave just right, the bow will catch (not cut) the wave and lurch left or right. It could cause the driver to fall, if he is standing. If the bow seating is empty...
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    Steering cable wont bend enough to come out of outboard

    Gee, what part of the steering cable did you clean? The center part is usually well sealed, and the ends are easy to lubricate, without removal of the steering cable.
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    1999 Mercury 40 hp 2 stroke Overheat

    As long as all cylinders are within 10% of each other, the actual compression value is not important. Put a torque wrench on the head bolts and see that they are tight. A couple of things, in case you do not know. Mercs will overheat at idle if the impeller is chewed up on it's bottom...
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    1999 Mercury 40 hp 2 stroke Overheat

    Compression leak can cause overheat, however, that usually occurs at high RPM. It still makes sense to take a compression test.
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    Staying warm on boat in the winter

    If you want to add heat to the boat permanently, it can be pretty easy to rig up. Go to a junkyard and get a heater core from some junked auto. Build a wooden box to hold a 12VDC fan and the heater core. You will need some sort of decorative gratings to let the heat out and air in. Install...
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    Impeller replaced

    The seal in the water pump output? They come with some of the impeller rebuild kits. I am not sure I ever actually replaced one directly, as they come installed in new pump covers.
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    18 hp Johnson no spark

    Gee, my newish digital multimeter has a capacitor test setting it reads in micro farads. A condenser used on magneto systems should be about .25 micro farads. My old (1950s/60s) multimeter could be roughly used to test a condenser. You set it to resistance and touch the leads to the condenser...
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    18 hp Johnson no spark

    Condensers absorb the voltage when the points open, lessening the chance of arcing. This voltage is immediately dumped back into the ign coil, helping to induce spark. If the condensers are bad, you will have no spark. They can be tested on modern digital multimeters, and roughly, on analog...
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