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    1984 75hp L4 with unique problem? I'm baffled!

    Do any of the spark plugs look real clean? If so, you could have water in the cylinders.
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    Mercury XR2 150 stuggling to get on plane.

    I doubt your charging system is an issue. However, disconnect and insulate the yellow stator wires from the rectifier or voltage regulator.
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    Mercury XR2 150 stuggling to get on plane.

    Gee, you get 4500 RPM. Anything above 2200 means the high speed stator is working. Did you check the fuel pump diaghram? If it leaks it floods some cylinders causing you to start accelerating on 5 or 4 cylinders. If this is happening, does it sound like it might struggle to accelerate? Motor...
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    Interchangeable lower unit for 2004 Mercury optimax 135 with 25 inch shaft and 2:1 gear ratio

    What does SEI say? They should list compatible gearcases across models.
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    Mercury XR2 150 stuggling to get on plane.

    Check the fuel pump diaghram. If it leaks, it can load up a cylinder or two at idle. It takes a bit of revving to clear the fouling. I bad high speed stator winding means no RPM faster than about 2200RPM.
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    1984 75hp L4 with unique problem? I'm baffled!

    That prop is likely too much pitch for that 'toon. However, you first need to get it to idle when in the water. Your timing light says all are firing? Not sure what else to suggest.
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    1984 75hp L4 with unique problem? I'm baffled!

    Outboards of that era do not have much in their exhaust passages. They are mostly wide open. If you drop the gearcase, you can shine a flashlight up the exhaust passage and see most of what there is to see. Did you say what your spark plugs look like?
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    I"m back with more problems

    Gee, fuel pump kits are usually pretty available. Have you tried ebasicpower marineengine or other web sites that carry Sierra and GLM products? An electric fuel pump can work, but they are usually set up using a relay from the charging system, so if the engine stalls, the fuel pump stops...
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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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