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    "Idling in gear"

    Mercury's shop manual for my 1994 225-HP carb two-stroke talks about checking the engine's idle speed when the outboard is "idling in gear." This seems like an oxymoron to me. I always thought the whole idea of an engine "idling" was that it was disconnected from its drive train (propeller in...
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    Attaching a dial indicator to engine cylinder

    The shop manual for my 1994 Mercury 225-HP two-stroke refers to using a dial indicator to bring cylinder #1 to top dead center (TDC) as part of timing adjustments. Mercury apparently sells a dial indicator for this purpose, but I have a number of them around my shop at home, and would just as...
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    Cylinder drop test -- when to disconnect wires

    A mechanic suggested conducting a cylinder drop test on my 1994 Mercury 3.0L Offshore 225-HP 2-stroke carbureted outboard to help diagnose rough running. In the test, spark plugs are disconnected one at a time to see what effect this has on the rpm. A substantial drop means that cylinder is...
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    1994 Merc 225-HP 2-stroke misses, stalls

    After working through some recent issues, the 1994 Mercury 3.0L Offshore 225-HP carbureted 2-stroke on my 21-foot center console still has problems. At moderate to high speeds it sounds like it's missing. At harbor speed or idle, it stalls out frequently. As a starting point, I'm planning on...
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    Water in carbs on 225-HP 2-stroke

    Recently I had the 1994 Mercury 3.0L 225-HP 2-stroke carbureted 2-stroke on my center-console boat tuned as part of annual maintenance. As noted in another thread here, when we took the boat out last week it ran roughly, misfired and stalled. Today I went back to the boat and it started...
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    Newly tuned Merc 225-HP 2-stroke runs rough, stalls

    Earlier this month I took my 21' center console boat with 1994 Mercury 225-HP 2-stroke outboard in for annual service. When I got it back in the water to move it to its slip, it seemed to run fine at harbor speeds. Then it sat in its slip for a couple of weeks during bad weather. This morning...
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    Intermittent ignition problem with 1994 Merc 225-h.p. 2-stroke

    The last time we tried to take my 21-ft Boston Whaler out, the 1994 Mercury Offshore 3.0L 225HP carbureted 2-stroke outboard died a few feet out of the slip. It would crank and crank, but not start. There didn't seem to be any difference if I tried starting it with the built-in gas tank or a...
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    Will loss of water pressure shut down '94 Merc 225HP 2-stroke?

    This morning we went down to take out my 21-foot center console for the first time in five weeks. The 1994 Merc Offshore 3.0L 225HP carbureted 2-stroke engine started normally. Just after we pulled out of the slip, the engine died. At this point it had run for a total of about 1 minute. After...
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    Poppet valve on 225HP 2-stroke

    Recently the overheat alarm has been going off on the 1994 Mercury 3.0 Offshore 225HP carbureted 2-stroke outboard on my 1995 Boston Whaler Outrage 21 when running at high speeds. I'm reasonably certain that nothing was clogging the water intake, and the impeller was just changed during annual...
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    New prop on 21-ft Whaler w/ Merc 225

    Hi all, I recently changed out the prop on the 1994 Mercury Offshore 3.0-Liter 225-H.P. carbureted 2-stroke outboard on my 1995 Boston Whaler Outrage 21. The engine originally came with a 19"-pitch Laser II. I typically run with four scuba divers and equipment (about 1,200 pounds all told). I...
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    1994 Merc 225 - 2-stroke oil pressure problem?

    Hi all, I have a 1994 Mercury Offshore 3.0-Liter 225-H.P. carbureted 2-stroke outboard on my 21' Boston Whaler. There is a reservoir for 2-stroke oil under the boat's console; air pressure from the engine's crankcase flows into this reservoir via one hose, causing 2-stroke oil to flow out to...
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    Alarm on 1994 Merc 3.0L Offshore 225hp 2-stroke

    Hi all, after a year of trouble-free use, last week I encountered a problem with the 1994 Mercury 3.0L Offshore 225hp 2-stroke (carbureted) on my boat. Twenty minutes into a trip, an alarm came on which I assumed was low oil (light flashing and beep once every 2 seconds). We didn't resolve it...
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