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  1. 100333624

    Tach adjustment help?

    Hello! So I finally got my tach running after realizing that the brown wire from the tach doesn't go to the rectifier, it goes to the brown terminal on the switchbox! After hours of fighting with it, reading online for help and adjusting the tach, BOOM it worked! So now that I know the tach...
  2. 100333624

    1987+ Merc 70/80/90hp variances?

    Hello all, I'm looking at purchasing a 1987-1990 Mercury 70 or 80 hp, these are the models where merc basically upped the displacement from 66.6 to 71.1 cu in and I was just looking through my manual and it shows the 70, 80 and 90hp models all are 71.1 cu in from 1987-1989, then in 1990-1992...
  3. 100333624

    Mercury 80s cowl differences in years?

    I'm looking to purchase a later version 75hp mercury possibly 1984-1989 and need to know how to tell the difference between those years by looking at the cowls. Which one of these pictures would be an 88 and which would be an 84? Or rather which is the later version? Any advice?
  4. 100333624

    Tachometer help please?

    Hello friends, I wanna pick up a tach for my motor, its a 1978 mercury 80hp (4 cylinder) and I have the 3 pin connection at the front of the controls for the tach. Boat is a center console, but the controls are mounted on the starboard side gunwale. Its a very narrow boat so they are easily...
  5. 100333624

    Steering replacement help??

    Hello friends, I have a 16' center console boat with a 1978 Mercury 80hp w/PT. I'm going to replace the steering on the boat because the one I have now is stiff and I wanna know what you guys think is a good replacement for a Teleflex 14' cable and single cable helm. Boat does 40mph as is...
  6. 100333624

    Shes alive!!!

    So I finally put my motor back together (1978 Merc 80hp 4cyl) and she struggled a bit to start up (hasn't ran since November) and after starting up tonight I think the starter was sticking, thankfully I have another one I can replace it with but how can I test it to make sure? It makes a weird...
  7. 100333624

    Mercury break-in period???

    I know this is a stupid question but I'm about to put my motor back together from changing a broken swivel bracket pin assembly and yoke. And I've consulted my SELOC manual and it mentions that when putting the powerhead back on that I'd have to undergo a 10 hour break in period where I SHOULD...
  8. 100333624

    How to clean engine parts

    Hello board! I took apart my outboard and before putting it back together I want to clean it really good because there is like 30 year old grease and oil all over the parts and its nasty. How do you guys recommend cleaning the parts, and what methods and or products to use? I am located in...
  9. 100333624

    Mercury 85hp vs 80hp?

    Ok bare with me in this post, I have to tell you guys this short story! So what a birthday its been today! Ok so 2 nights ago I said a prayer (yes I believe in Almighty God!) due to my extreme financial situation (car accident/surgery/job loss) my insurance has been treating me, ummmm, the way...
  10. 100333624

    Removing rusted bolts HELP!!!

    So I got my powerhead off and now I am stuck... What you are looking at is right below the powerhead on the main part of the engine, where the lower unit driveshaft sticks up about 2 or 3 inches, there are 2 bolts that I have to remove in order to get to the swivel bracket assembly that I'm...
  11. 100333624

    What else to check??

    Hi guys, So I've got my engine ready for powerhead removal. I've removed everything needed and now it's pretty much ready for the hoist to lift. But I got a question for you guys since this is the first time I'm doing this.. Now that I'm gonna have the powerhead off and easy access to...
  12. 100333624

    Mercury 800, broken swivel assembly shaft HELP!

    I decided I'm going to keep my 80hp instead of upsizing to a 115. I have to take apart the swivel bracket assembly because something in there is loose or broken. I see a big ring sitting on the bottom on the shaft that is loose, or broke off from somewhere and the motor is able to be pushed...
  13. 100333624

    Mercury I6 115 '83 -/+?

    Hi all, I've decided to dump my motor ('78 mercury 800, 4cyl) and go with an inline 6 mercury tower of power 115... I just know there are some differences depending on which one I go for, and there's quite a few available in my area from 1966 - 1988! Lots! So the first question is, I've heard...
  14. 100333624

    Help with steering and controls?

    Hi all, I hope y'all had a wonderful thanksgiving weekend! I need some help, I've got a 16' center console with a 1978 mercury 80hp. I was looking to get a hydraulic steering system to replace the cable steering I have now because it was a little too stiff trying to control at 40mph, what are...
  15. 100333624

    2 blade prop for big merc?

    Hi guys, I ended up picking up a 16' boat that came with a 1978 Mercury 800, the 4 cylinder model. The motor has the original 3 blade prop on it. The boat ran exceptionally fast and I was impressed, it did about 40mph with me and the previous owner on board, not to mention the excess water...
  16. 100333624

    16' Marvac floor/stringer repair

    Hi all, First off I want to say that this is my first post here, finally! There's lots of great people with fantastic advice on here and I'm thankful for iboats as I've got a lot of help from searching the forums! On to my post! So I traded my old 12' aluminum that was fully customized for...
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