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  1. S

    80 hp mercury 79'

    This motor has never charged the battery since I've owned it. At some point I believe I tested and deemed the rectifier bad.. Just got a new one.. How can I be sure the charging system is working?
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    80 HP Mercury Outboard

    What ratio do I use on gasoline to oil? Its a 1979 motor.
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    1979 80HP Mercury - Not Firing on 2 cylinders

    I've done quite a few repairs on this motor and feel like I have a pretty good understanding of where I've gotten to in my troubleshooting so I guess you'll need to trust me some. I've isolated the problem to the stator/trigger or switchbox. Which leads me to my question.. I'm having a hard...
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    Crack in top of transom

    I have a crack at the top horizontal part of my transom. This boat is a 1979 procraft and frankly, its old.. Its given me some great summers and some horrible ones. It was given to me for free and I've done a bit of work on it specifically the motor. I have had it for 5 years and these cracks...
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    Fuel Tank Vent Hose

    Having a problem finding the right size hose for the vent on my fuel tank.. The boat is a 1980 procraft and the hose was dry rotted. Its quite a bit larger than a 3/8 fuel hose. My question, which is probably a little foolish. Does this hose have to be rated for fuel? I would assume yes, but...
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    Radio Shack Rectifier and heat?

    I concluded my rectifier was bad..<br /><br />I had the same voltage not running and running at about 2500 rpm.. <br /><br />I purchased the radio shack full-wave bridge rectifier rated for 25amps.. I installed it and now when idled up to 2500 rpms I go from 12.6v to 13.4 volts.. Which seems...
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    1979 80HP Mercury, not running.

    Ok.. For 3 years I have been working on this motor. I have replaced 2 coils and the "switchbox". Last year it ran but had no power. After pulling out the plug in the bowl of the top carb I realized it was not getting gas to the top carb. I pulled the bowl off and the needle valve was stuck. I...
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    80HP Mercury, 15 FT Bass Boat.. Pulling hard to left.

    Trimmed all the way down my boat pulls so hard to the left that I am afraid if my hands slipped on off of the wheel that the boat would flip. I have adjusted the small fin above the prop, in both direction and it didn't seem to make a difference. When I trim my motor up while moving I can get...
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    70 HP Mercury Force - Lower Unit and QUESTIONS

    Ok.. First, Mercury Force is just a Mercury motor right? Someone told me it wasn't really Mercury. Second, there is oil leaking slowly from I believe the lower unit.. I have a 1979 80HP Mercury that I just had to replace the water pump on, are the two lower units similar? Reason I ask is that...
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    70 HP Mercury Force - Lower Unit and QUESTIONS

    Ok.. First, Mercury Force is just a Mercury motor right? Someone told me it wasn't really Mercury. Second, there is oil leaking slowly from I believe the lower unit.. I have a 1979 80HP Mercury that I just had to replace the water pump on, are the two lower units similar? Reason I ask is that...
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    '79 89HP Merc. / HARD PULLING

    I have a 15 foot procraft with a 80HP Mercury motor. At full speed the boat pulls very hard to the right, so much so that if I let go I would be worried about flipping.. Is there an adjustment on the motor to compensate? I don't know the name of the little fin on the lower unit, but it...
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    80 HP Mercury - Lower Unit INSTALLATION

    Ok.. I have had lots of problems getting to the point I am at.. But let me say its a great feeling to hear the motor run.. The only problem left is that I noticed when I started my jmotor for the first time I didn't see an water being spit out. I then dropped my lower unit and am in the process...
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    80 HP Mercury / SWITCHBOX 332-5772

    Anyone have a working used one that they want to get rid of? <br /><br />A switchbox, P/N 332-5772
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    80 HP Mercury (S/N:5480961) 1 CYL not firing.

    This may be preliminary, but..<br /><br />I have one cylinder not firing on this 80HP merc. I thought it was the coil without doing any tests and it wasn't at all.. I replace the wiring for number 3 and 4 (3 is the on not firing).. Still nothing.. I know that the stator or trigger was replaced...
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    Running with no water?

    Can I run my outboard for a short period of time without water? I am talking about 30 seconds at the most.
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    Determining PROP Pitch.

    How do I determine the proper pitch for my prop. I have a 1980 fiberglass procraft fishing boat with an 80HP mercury on it. I had an aluminum prop that was siezed and had to destroy it to get it off. So I don't know what to replace it with. Can anyone help?
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    How bad can bad GAS be???

    Ok.. I have a boat that sat most of the year last year and through the winter.. I took it out for the first time this year and it ran great.. The second time.. Aweful.. I replaced the plugs and it appears to be running better.. Only thing.. It smokes like crazy.. My thought is that one, the...
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    Trolling Motor Control Board

    I have a 23 year old boat. It used to have a trolling motor on it that pluged into a control board on the front of my boat.. The board displayed battery voltage, and gave me the option to toggle between two batteries... I have since replaced the trolling motor.. And now the switches on this...
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    80 HP Mercury TROUBLE

    Ok.. I have an 80hp mercury outboard.. I didn't winterize it.. First time out this spring it ran better than it ever has. Replaced my prop and now it only runs about half power. Could this just be plugs?
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    HELP ME? 80 HP Mercury...

    I have an 80 HP Mercury outboard.. Its probably 20 years old.. It has an aluminum prop on it, and the prop is in really bad shape. I bought a stainless steel prop and went to replace it and can't get the aluminum prop off.. I have talked to a few local boat repair shops and everyone confirms...
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