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  1. B

    1973 25hp Johnson only reaching 5mhp

    Off the spark plugs?
  2. B

    1973 25hp Johnson only reaching 5mhp

    It's on a 15ft 1975 Meyers fishing boat. No marine growth however there could be 400lbs of water soaked into the foam. Do you think it would effect it that much?
  3. B

    1973 25hp Johnson only reaching 5mhp

    I'll give it a try.
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    1973 25hp Johnson only reaching 5mhp

    I replaced both plugs. I will say day one it was running on one cylinder. I could hear it and I had a fowled plug. However since putting new ones in its not making that noise. But I'm still not getting speed.
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    1973 25hp Johnson only reaching 5mhp

    When it's running it doesn't change audibly. I'd think if it was a prop hub or drive pin it would either Rev high or bogg wouldn't it?
  6. B

    1973 25hp Johnson only reaching 5mhp

    Compression is 145 in both cylinders. Starts right up and stays running. I don't think ignition system is having any issues
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    1973 25hp Johnson only reaching 5mhp

    You I've got a 1973 Johnson 25hp outboard motor. Runs great in all aspects and in the barrel test putting it in gear it audibly sounds and visually seems to reach full throttle and max rpm but after putting it in the river it doesn't sound like it's reaching max rpm and only pushes about 5mph...
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