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Recent content by ChipperStrauss

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    1972 Mercury 650 3 cyl timing

    It is quite bright and warm these mornings. So, I though I could keep the boat and engine inside the garage to set the timing. Is it a good idea to set the timing with a timing light without the spark plug wires connected? It seems I could attach the spark meter to the #1 spark plug wire...
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    1972 Mercury 650 3 cyl carb floats

    I found a CDI Electronics Troubleshooting Guide online at Marine Engine.com. Here are the tests: This set of tests added #6 to test the DVA voltage coming out of the trigger. A low reading (below 3V DVA) means a bad trigger. Well, I got 3.5V DVA. So then, I went on to test the DVA voltage...
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    1972 Mercury 650 3 cyl carb floats

    Thank you for your responses. Does anyone know how to keep logged in for longer periods of time? It happened again that I lost my text when the forum said I needed to log in again. It is quite frustrating. OK, back to business… How much fuel goes into each cylinder? Could I also squirt...
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    1972 Mercury 650 3 cyl carb floats

    After a few days, here's an update. Two days ago, I borrowed a compression gauge from the local auto supply and checked compression. #1 70, #2 72, #3, 70. I found the results unusual since I recall checking the compression just prior to starting down this road and it was, as I recall, about...
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    1972 Mercury 650 3 cyl carb floats

    Gentlemen, As you are probably aware, the design of the 3 cylinder Mercury 650 makes it a pain to remove the carbs although I am getting pretty good at it. (When Mercury engineers changed the design to 3 cyl from 4 cyl, they just moved the two carbs closer together without leaving room to access...
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    1972 Mercury 650 3 cyl carb floats

    What would the performance symptoms be when the float valves have failed. Seeing fuel spil into the carbs when priming with the bulbs is certainly a symptom. But, what would one experience in performance? e.g. failure to start, stalling, etc.?
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    Mercury 650 3 cyl fuel pump

    What would cause the fuel to turn yellowish from blueish? I have a clear fuel filter prior to the fuel pump. When shut down, the fuel inside the clear fuel filter turns yellowish. I suspect the fuel filter diaphram may have a hole causing partially burned fuel to get back into the fuel line. I...
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    Mercury 650 3 cyl cooling issues

    I have a 1972 Mercury 650E 3 cyl. I have a water oil whitish foamy liquid coming out the upper starboard engine mount. I removed the power head and exhaust plate from the middle section drive shaft housing. There was only a little water near the engine mount. I have a few questions. Is it normal...
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    1972 Mercury 650E factory propeller spex

    I can't seem to find the spex for what the factory standard propeller should be on my 1972 Mercury 650E 3 cyl outboard. I want to make sure that someone in past has not exchanged the propeller. I have been reading up on setting the idle mixture and speed and discovered the wrong prop can make...
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    1972 Merc 650 3 cyl trigger testing

    I would like help with testing the trigger on my 650 3 cyl. I can't seem to locate any spex (like an ohms resistance value) to tell me if the trigger is good. The only way one can tell is if it causes the coil to spark. I have a CDI Electronics aftermarket switch box. I can manually spark the...
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