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  1. M

    Oil/fuel leaking from water intake Merc 40 4cyl 2S

    1991 Mercury 40hp Classic 4cyl 2-Stroke Hello all Had a bit of an engine day on Friday with the boat sat on the swinging mooring Had stalling issues due to idle speed being too low, adjusted it up and all good Even got my shift linkage adjusted so no pre-tension in any direction on the...
  2. M

    Beating Noise while Underway

    I’ve got a 1990 40hp 4cyl 2-Stroke the boat was last in the water 3 years ago and due to circumstances I’ve not had time for boating until this year so have dusted it off to get going for this season. the last season I had the boat in the water it started making a deep bassy beating noise...
  3. M

    40hp 4cyl 2 stroke - Internal fuel lines

    Hello all ive got a 91 2stroke 40hp 4cyl Merc and wondering if anyone here knows the gauge of the internal fuel lines . The ones that link up the carbs and link the fuel pump to fuel filter etc. Reason I ask is because when I bought this motor 10 years ago it had transparent pipes inside...
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    High Voltage from Merc ?????

    Engine Details : Mercury 40HP 4Cyl. Classic 2-Stroke 1991 Model : 40 PTTO Serial : 09682741 Boat out of the water for a couple of years old fishfinder replaced and New VHF and Plotter fitted Now VHF and Fishfinder reporting Excessive Input Voltage - When I found out about the issue the...
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    Anyone know what size spanner to use on my Merc Powerhead Nuts ?

    I'm about to remove ... ahem...... Try to remove ... the powerhead from my 1991 40hp 2str. 4cyl. engine. I've disconnected all the ancilliaries and have cleaned up and being WD-40'ing the hell out of the 8 x nuts for the past 48 hours. Trying desperately to avoid bolt/stud breakage. The only...
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    Exhaust Smoke and Water Leak on Mercury 40 2-Stroke 4cyl 1991 Classic

    I have a Mercury 40 2-Stroke 4cyl 1991 Classic, only owned the boat/engine for a couple of years and learning slowly. At the end of last summer while on the water I noticed more exhaust smoke than usual on the boat and after inspecting the outboard found that there appeared to be exhaust smoke...
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