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    Foot throttle for dual 6.2l 350 ECT

    Hi all, I have a Jet Boat that has twin Mercruiser 6.2l 350 ECT engines. The throttle is via a foot pedal. https://www.mercurymarine.com/en/us/engines/inboard-and-sterndrive/mercruiser/inboards/ What would be the best method to connect both engines to a single foot pedal? Can a single...
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    90hp Water pressure gauge

    Mercury 90hp 1988 s/n 0b312461 Hi all, I want to install a water pressure gauge on my boat. Am I correct in thinking that I use the port that if near the spark plugs (currently has a brass bolt in it)? What thread size does this port have? And I need a 15psi gauge? Thanks in advance...
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    Hull Poslishing

    Hi, I have a 17 foot Fibreglass Cabin Boat. The tops sides of the hull are regularly polished, however, the underside has never been. It is still in excellent condition. The boat is stored on a trailer, and almost always used in fresh water. There is no growth or anything like that. What...
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    Trim Tab / Steering problem

    Mercury 90hp 1988 s/n 0b312461 I have 2 questions, both related to the same issue. 1) The trim tab behind my prop became loose, and I think it has moved from it's correct position. How do I go about finding it's correct angle again? 2) The motor has become very loose to steer (NOT loose on...
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    Setting of idle/low speed screws. Merc 90

    Hi all, Mercury 90hp 1988 s/n 0b312461 I know some or all of the idle screws on my carbs have been set too rich. This has resulted in smokey idle and smokey acceleration. Neither of these two things used to happen to quite this extent. Carbs were linked and synced my a Merc dealer 12...
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    Twim Switch Retrofit

    Hi all, Mercury 90hp 1988 s/n 0b312461 I have purchased a Mercury Trim switch that I'm wanting to retrofit to the Cowl of my engine. However, I need a wiring diagram to be sure I have it connected correctly. Can anyone help please? Thanks, Donald.
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    90hp Oil Line replacement

    Hi all, Mercury 90hp 1988 s/n 0b312461 Just doing a check of my 90hp, and noticed the clear hoses that run from the tank to the Oil pump are hard and showing cracks. I'm going to replace the whole lot, but just have a few questions: What size is the hose? Do I need special fuel hose for this...
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    Fuel Gauge problem

    Hi all, I have a fuel gauge that has stopped reading the fuel level. It's permanently stuck on 'E'. Before I start tearing the wiring apart, I was hoping for some advice on where to look, and how the level is measured by the sender and gauge. I recently installed a new aluminium floor over my...
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    Power Trim Fluid

    Hi all, What do I use to top up the Power Trim reservoir in my 1989 Merc 90hp? From memory I was told to use ATF fluid last time. Does this sound correct? Thanks, Donald. New Zealand
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    Power Tilt/Trim

    Hi all, 1989 Merc 90hp I took my boat for a run on a small lake near home a couple of days ago to burn off fogging oil and test after I replaced thermostat, impeller, and fuel pump etc. When I was putting the boat on the trailer, to get it up the final few inches, I had to use full throttle...
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    7.5hp Disconnect Electrics

    I have a 1984 Merc 7.5hp 2 cyl 2 stroke. It's electric start, but I'd like to use it occasionally without a battery. What do I need to disconnect in order to not fry any electrics while it's running when not connected to a Battery? Thanks, Donald. New Zealand
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    Impeller Gasket replacement

    1989 Merc 90hp 3cyl, 2stoke Hi all, I'm putting a new impeller in my lower unit, and also replacing both gaskets, as I think the old ones are the originals from he factory. Whats the best way to clean up the stainless plate thats on the bottom of the pump, and also how do I clean up the area...
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    Merc 90hp Misfire at idle/low revs

    Hi all, I have some work done on my 1988 Merc 90hp done about a year ago. Since then it will occasionally backfire at idle/low revs. I have tried enriching the mixture screws on each carb by 1/4 turn, but no difference. I haven't taken it back to the shop as he has now closed down. Last...
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    Trim Tab Bleeding

    Hi all, I have a set of Gibson Trim tabs. The ones with the levers to control the hydraulic actuators. Couple of things are happening/not happening. When I push the levers forward to lower the tabs, one doesn't lower as far as the other. When I pull the levers back, they do not retract...
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