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  1. M

    1977 Johnson 70 Horse Salvageable?

    Ok so I finally broke down and split the case on my 1977 Johnson 70 horse as some of you already advised. I was redoing the exhaust manifold gaskets and found rusty water in the exhaust ports and I could see the scored pistons so I tore it down. It doesn't look pretty to me but it's been a long...
  2. M

    My 1977 Johnson 70 Horse Struggles All Combined

    I have made a few different threads about various stages of my struggle with my boat motor. I made this post to compile all of the information together and hopefully get this figured out (like the on-my-knees-begging kind of hopefully). Ok, this post is going to be a long one so buckle up. If...
  3. M

    Am I testing my coils correctly?

    Edit: I have a 1977 Johnson 70 horse. When I had it running on muffs in the garage earlier the engine bogged on every cylinder when I pulled the plug wire. That tells me the engine was firing on all three cylinders. I was just checking my coils with a multimeter. I set my multimeter to the 20...
  4. M

    Runs great wide Open but hard to get it there

    Hi all. So I finally got my boat with the 1977 Johnson 70 horse back in the water after replacing all my head gaskets and exhaust manifold gaskets. Ran great on the hose in the garage. Idled good and revved strong. When I got it in the water today it was a totally different story. It basically...
  5. M

    Advice on Temporary Pressure Relief Valve Removal

    Hi again guys. So I have my head and exhaust manifold off my 1977 70 HP Johnson. The powerhead had previously suffered an overheat and it melted the pressure relief valves. I found pieces of them throughout the water jackets. The thermostat works as it should. I put it in a pot of water on the...
  6. M

    Older Johnson Outboard Exhaust Plate Warp Issue

    Ok, so I've been digging into this 1977 Johnson 70 Horse motor for a couple weeks now. Quite literally. I've also been researching known issues. It seems to me the biggest known issue with this motor is the warping exhaust plate. As far as I can tell, that issue occurred in a LOT of Johnson...
  7. M

    Wrong impellar?

    Hi guys. So a little back story.... I bought this boat a couple weeks ago. This is my first boat in 25 years. I am very mechanically inclined and if it runs, I can usually fix it. Engines anyway. Everything below in an outboard engine I am a complete amateur and learning as I go along. The...
  8. M

    Repairing small cracks in livewell

    I have some small cracks in my fiberglass livewell that are dripping into the hull of my boat. I've never done a fiberglass repair but I watched videos so now I am a YouTube expert. :ROFLMAO: Anyway, the outside of the livewell is covered in foam overspray and what looks like Flex Seal to me...
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