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  1. M

    Need guidance on Prop pitch and Power, 78 Johnson 55hp 55EL78S

    Yes I know you did. And I found that listing also. That had me confused. Thanks Jimmbo.
  2. M

    Need guidance on Prop pitch and Power, 78 Johnson 55hp 55EL78S

    I'm back! I am happy to report that the compression is 128 and 130. I checked it with two different gauges and multiple times so I was pretty happy about that. I started with the gap tester. At idle it jumped a half Inch gap. But it was cutting out at higher rpms and seamed rich. So I started...
  3. M

    Need guidance on Prop pitch and Power, 78 Johnson 55hp 55EL78S

    Thanks, Im gonna start checking all that out very soon. Local Napa didn't have a gap test tool so I got one coming. I dug out my compression gauge but it's ancient and was a cheep one anyway. So I got to pick up a new one. Also found the original Johnson service manual specific to that engine on...
  4. M

    Need guidance on Prop pitch and Power, 78 Johnson 55hp 55EL78S

    Just want to thank you all for your help and knowledge. I only wanted to buy my first boat. I didn't expect it to be so difficult. When I started I knew nothing about these motors. They are a different animal. I learned that they can run smoothly in one cylinder. I thought for sure on a 2...
  5. M

    Need guidance on Prop pitch and Power, 78 Johnson 55hp 55EL78S

    I appreciate that. I really didn't mean to challenge anyone. I was merely telling everyone other things people have told me. Like the guy who acted like the compression numbers were fine. As far as I knew they were normal for that motor. It is sometimes a little tricky when you hear conflicting...
  6. M

    Need guidance on Prop pitch and Power, 78 Johnson 55hp 55EL78S

  7. M

    Need guidance on Prop pitch and Power, 78 Johnson 55hp 55EL78S

    Now wait a second. I am heeding there advise. I am taking it ALL in and learned about things completely foreign to me. I don't think anyone is wrong about what they're telling me here. Racerone thinks I'm trying to say he's wrong about the compression but that is not true. I am thinking he is...
  8. M

    Need guidance on Prop pitch and Power, 78 Johnson 55hp 55EL78S

    That is some good information. I've been meaning to get one of the spark tools anyway. So if it is cutting out, what is usually the solution? Also, this boat came from 1000ft elevation and is now at 6000ft. I know on my old carbureted 4 strokes they would need adjusted. I haven't really looked...
  9. M

    Need guidance on Prop pitch and Power, 78 Johnson 55hp 55EL78S

    These outboard motors are definitely different then anything I'm use to. But definitely not running on just one cylinder. it actually runs quite smooth. Its just really bogy. thanks for the response.
  10. M

    Need guidance on Prop pitch and Power, 78 Johnson 55hp 55EL78S

    More of the story...I bought it from a very large marina and boat rentals business. They did the compression test right in front of me. They showed me the results like they were something to be proud of. I am very knowledgeable about things like small block Chevy's and the like. I was surprised...
  11. M

    Need guidance on Prop pitch and Power, 78 Johnson 55hp 55EL78S

    First of all, I am completely new to the boating game. I purchased a little 82 15 foot sea swirl. What you would call a runabout I guess, its a closed bow, with a 78 55hp Johnson 2 stroke. I heard it run before I bought it, but it didn’t have a prop. I tried to research props but couldn’t...
  12. M

    Pulses per Rev

    I know this is a 20 year old thread, but, I want to thank those here who answered my question. I have rebuilt small block 350s, and 22R 4 cylinder engines, but I was at a loss when my new tach asked me the spark per revelation of my 2 stroke 2 cyl outboard. Plus I'm very green in the world of...
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