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    1980 Mercury hard to start

    What is the factory recommended procedure for starting this motor? I have tried and succeeded in many ways but I would like to know what the factory advised when the motor was produced. Thanks!!
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    1980 Mercury 40 wouldn't run much above idle

    The other night, we took the boat to the lake and my buddy, who admittedly is "getting his feet wet" with his new boat tried to get it started, (might have flooded it), had a hard time, finally did and got it to the dock. So I parked the car, got in the boat and we left the dock. With the...
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    NSF4A won't run above 1/3 throttle

    I have recently got this outboard running. I: Changed the lower unit oil. Replaced the complete water pump. Changed the engine oil. Lubed all the grease zerts. Cleaned and gapped the spark plug. Drained and flushed the gas tank and rebuilt the carb. So we get it on the lake the other day and...
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    Nissan won't idle/Help identify please

    Trying to help a friend with a Nissan 4 stroke, Mod NSF4A 3H9-1 and Ser 11450. 1) What year and hp is it? 2) It won't idle and will only run at higher RPM. It jerks when put into gear (at higher RPM). I am guessing the carb is dirty and needs rebuilt. Idle circuit clogged. I have...
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    1980 Mercury 40 hp outboard tach problem

    I have been working on this outboard and the tach was not operating when I first got the outboard running. The electrical system was not charging the batter and I found a bad regulator/rectifier. I replaced that and now the tach is doing this. When I pulled the wiring harness plug out of the...
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    1980 Mercury 40 hp outboard water leak

    Alright gents, heres the problem. This motor wasn't run in years and was of unknown condition when my friend bought it. I replaced a complete water water pump on this motor and then had a water leak inside the cowl (a hose running from the lower aft port side to the fuel pump). I replaced...
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    red stuff on carb brass plugs!

    I am trying to rebuild a Merc 40 carb and four brass plugs have a coating of red (Threadlocker?) on them. I was able to remove two of the four but would like to be able to remove the rest to ensure those passages are clean. Any thoughts?
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    1980 merc 40 not charging/wont idle/water around cowl

    After purchase of the boat motor, found two burnt/disintegrated wires coming out of the switch box assembly (white and red) and we repaired those. Also found one loose wire coming from the stator and a loose connector on a unit, so we installed it. Suspect this was the right place to put it...
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    how do i drain the carb of a 1980 mercury 40?

    I am trying to get a 1980 boat with a Mercury 40 going. I have drained the gas tank which had a great deal of water in it and put fresh gas in it, flushed the line between it and the fuel filter, and removed the filter casing, which was half filled with water and cleaned the filter of sediment...
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    Mounting battery boxes on fiberglass hull

    I am helping a friend get a fiberglass Hustler bass boat on the water. We are completely recreating the electrical system due to it's condition. So we are planning to place two batteries in the bilge area in the back. One starboard for the outboard and general ships electrical, one midships...
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    Switch Box Assembly wires burnt

    I am helping a friend get a 1980 Mercury 40 with Thunderbolt Ignition going. We found two wires coming out of the switch box assembly (33 24911) to a connector block missing insulation and fried to almost severed. We soldered in new wires but I am wondering if the unit is no good and that is...
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    Carb cleaner in gas

    On several forums here, I have got the message loud and clear to not use Engine Starting Fluid in a two stroke, but can I spray carb cleaner into a carb like I can a four stroke? Can I safely add carb cleaner to premix to alleviate carb problems or for general cleaning? Is is safe for the...
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