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Recent content by donaldboyer

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    Backfire at low revs

    Hi all, 1988 Merc 90hp 2 stroke, 3 cyl Serial #0b312461 I have an issue with my engine in that it seems to back fire a little at low revs. I tried to video this today, but it wouldn't do it while I have the camera running! haha! At low revs (900 - 1500 rpm) in OR out of the water, it...
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    Thermostat / Poppet valve replacement.

    Hi all, 1989 90hp I want to replace the thermostat in my engine as I think it is the original. Can anyone give me any advice, or things to do/not do etc. Does anyone have a link to a Selocs manual for this job? Also, do I need to replace the poppet valve as well? Talked to the Merc guy today...
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    Merc 7.5 impellor replacement

    Hi all, 1984 7.5hp 2stroke 2 cyl Recently the starter button was accidentally pressed on while this engine was out of the water. Was cranking for approx 20 seconds. I want to replace the impeller, and haven't done this engine myself yet. Apparently this engine has a copper water tube that runs...
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    Service Poppet valve and Thermostat

    Hi all, 1998 Merc 90hp 3cyl 2stroke Its the beginning of Winter now here in New Zealand. And this is the time when I usually to a bit of maintenance on my outboards. I want to service the poppet valve and replace the thermostat on my engine. Just want to know the procedure for each before I...
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    Oil / Water presure gauge

    Hi all, So Im on the hunt for a water pressure gauge for my Merc 90. Water pressure gauges seem to be a heck of a lot dearer than Oil Pressure gauges. My question is: can I use an Oil Pressure gauge to measure Water pressure? Are the internals different (aside from the dial face saying 'Oil')...
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    Water Pressure Gauge location/range

    Hello from New Zealand! I have a 1988 90hp 3cyl. I would like to install a water pressure gauge for peace of mind. Two questions: 1.) Do I install a T in the water hose that leads to the pisser, or (preferably) is there a port on the Power Head that I install a connection? 2.) What pressure...
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    Tandem Trailer Shaking

    Hi All, I have a 17ft Fibreglass Boat on a tandem trailer. At the weekend I noticed at certain speeds (80-90kph and also at approx 105kph) the sides of the trailer seem to rapidly shake up and down by approx 7cm. The shaking seems to be cntered just infrom of the wheels at the point where the...
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    Car charging boat battery

    Hey All! I was thinking about how to keep my batteries topped up in my boat while on the long drive to the lake with the fridge running. Both my boat and my towing vehicle are 12v, so was thinking I could connect the boat batteries to the cars 12v system while the car engine was running to...
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    Drain Carbs

    Hello, I am about to winterize my engine (Merc 90hp 3 carb). I have mixed a tank of fuel with fuel stabiliser, but I understand there will be some fuel still in the carb bowls, lines etc etc. I want to remove the carb bowl bung, but I see in the manual the main jet is also with this bung. If...
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    90hp Cowl trim retro fit

    1998 Mercury 90hp 0b312461 Hello, I'd like to install a cowl mounted trim switch on my outboard (this model only has trim switch on remote). I have found an appropriate switch (toggle rated IP65) 2Oamp @ 14v. Should I connect this directly to the solenoids? Or by patching into the wires from...
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    Cough at idle 1988 90 hp

    Mercury 90hp 1988 90hp 0b312461 Compressions 110lb on all 3 cyl. Had our boat out today for first run since being at the shop for carb rebuild and clean, and new stator and switch box. Ran for about 20 mins at 4000rpm, then were looking at some fishing boats at idle speed and she had the...
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    Trim Gauge

    Hi, Are Mercury trim gauges for outboard and inboard the same? Have a family member who has an Alpha One leg and he wants to fit a trim gauge (I have a spare for my Merc outboard) Donald.
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    Toolkit 1988 90 hp

    Hello, I am wanting to put together a small tool kit to keep on our boat for our 1988 90hp Merc. Are there a few common socket sizes that I should get that fit the engine. I dont want to carry a full set, just the common ones that I need. Does Mercury have a few common sizes??
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    Throttle Cable replacement...

    1988 90hp Mercury 3cyl 2 strk Just had the throttle cable break on me - bugger! Anyway, I'm fairly certain I can replace this myself. Just wondering are there any tips anyone can share that can save me some time/mistakes? Or anything I need to do or NOT do? Thanks....
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    Warning beeper faulty? 1988 90 hp

    Mercury 90hp 1988 s/n 0b312461 I'm not sure if the warning horn is working properly on this motor. It should beep when I turn the key to on but it does this intermittently. I suspect it may be a loose wire as it crackle sometimes as it beeps - in order to find the problem I need a way to make...
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