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    Mercury 80hp 800 1970s LU oil type

    What’s best to use for the lower unit?
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    What can cause weak spark? 1972 mercury 50hp

    I fired it up for about 20 seconds and it ran fine. Went to give it throttle and it died abruptly. I couldn’t see any spark when I checked. There was frayed cabling going to the distributor from the switch box so I replaced it. Now the spark while cranking with the starter is very weak and...
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    1975 Mercury 50hp won’t start

    A while ago I fryed the switch box on this engine by making contact on a terminal I shouldn’t have with the battery still plugged in. I replaced the switch box and it regained spark. Turned it on about 3 times but haven’t had the chance to tune the carbs on the lake, seemed to run fine on muffs...
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    1978 Mercury 500 50 hp No Spark

    I recently bought my first boat and outboard. I ran the motor a couple times for a few miles, but the wiring needed to be redone. So as i set about to rewire it, one of the wires from the second to the top post of the switch box made contact with and sparked on the positive for the starter. Now...
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