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  1. D

    2009 Mercury Optimax Idle / Low RPM Issues

    I'm busy drinking coffee upstairs, so no FMM in front of me. I assume you're on 193?
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    No Spark going to plugs

    I see that now but didn't investigate that far when I posted. TBH, I'm to the point of selectively saying no to working on these things. Another train of thought is that these old Mercs have brittle to non existent insulation on the wires. So I would give all the wires under the cowl a close...
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    omc sterndrive coupler bushing play

    Tight like a prop? Yes. More visible? Not really. If it's bad, engine needs to come out.
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    No Spark going to plugs

    I wondered if Fond Du Lac threaded them in or not.
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    No Spark going to plugs

    Not necessarily. I assume this thing has the upside down distributor? Probably the rotor & shaft assembly. Plastic of rotor cracked & spark arcing to ground? Like Racer said, check for spark from coil. Remove the center wire from the CAP. Hold it near ground & crank engine. If spark, then most...
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    removing covers on lower unit?

    Maybe screws 12 & 24?
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    2005 5.7 MAG - No power to dash - Combo switch trips breaker

    Oh I thought only my batteries were gaining weight.
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    2005 5.7 MAG - No power to dash - Combo switch trips breaker

    Swap the batteries around and see if problem follows
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    115 mercury 4 stroke efi long beep then dies

    Probably not the neutral safety switch (as in starter circuit) but maybe a switch that tells the ECM the engine is in gear?
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    1978 Mercury 200 20HP 2 stroke outboard

    You're welcome, use the .057
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    1978 Mercury 200 20HP 2 stroke outboard

    Of course if he is at high altitude....
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    Shift cable adjustment driving me crazy

    Go slowly as you cut the threads deeper it's hard to uncut them later.
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    1984 quicksilver throttle control

    I understand your question and issue. Like I said in my 1st response if the cable or cables are for some reason preloaded - in other words, an adjustment of either cable at the engine end is incorrect, it will transfer all the way back to the shifter & cause the button to bind. Do what I said in...
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    Shift cable adjustment driving me crazy

    Either you need to adjust the stud up the slot (dir more reverse pull) or learn how to push & pull the slack from the forward cable at each step.
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    1984 quicksilver throttle control

    Disconnect both cables at engine end. If 1 is preloaded (as in not adjusted properly) it will bind.
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    Shift cable adjustment driving me crazy

    In post 1 I thought that you implied if you pulled it manually into reverse it locked. Maybe I misunderstood. Regarding the threads: Per Mercruiser SB, you use a special straight tap (remember, pipe threads are normally tapered) to chase the treads from the transom side to verify you are...
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    Need impeller for 70s mercury 9.8 hp outboard

    Here is the link: https://www.marineengine.com/parts/mercury-outboard-parts/110/1865779-thru-2798056/gear-housing-assembly-complete-cont
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    Seized VP 5.0GL - Options/Insights

    *Cone clutch drive, the water pump is on the front of engine. *The drive unit has 6 vertical holes on each side. Those are the normal water intake. *I believe, unhook trim cylinders, remove the 6 nuts & yank the drive off, but wait for a VP guru to verify. *Find water intake hose from transom to...
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    Shift cable adjustment driving me crazy

    1978, your shift interface adjustment lever has the short slot (about 7/8" vs older long slot about 2"). ****ALL SHORT SLOT UNITS USE 6" ADJUSTMEMT.**** 5 7/8 was long slot only!!! Forget about this dimension unless there is some evidence your 1978 drive was at some time in the past replaced...
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    Shift cable adjustment driving me crazy

    I agree with kghost, the boat is 50 years old but highly unlikely the cable was original. Do you know the boat's history? Yours was at the time of manufacture a "thread from the transom side design". It is possible to & typically replaced with the newer "thread from the drive side" cable...
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