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  1. #1

    Default 1980 Johnson 25hp... weird problem

    I was having a few issues with my 1980 Johnson 25hp. It was very cold natured and was having issues idling among other things. I decided to pull the carb off and clean it and put a new carb kit in it. It is factory electric start so in order to remove the carburetor I had to remove the starter. Now, after getting it all back together it will not even try to fire. I know it is getting fuel because I can smell it in the cylinders when I remove the plugs. I also know that it is getting spark cuz I tested that by ground them to the block. Is there anything that anyone can think of to try? I wanted to rule out a fuel issue so I sprayed a little bit of starting fluid in the cylinders and it still did not fire off. I am baffled!

  2. #2
    Join Date
    Jan 2012
    Location
    Giessendam, Zuid-Holland, Netherlands, Netherlands
    Posts
    102

    Default Re: 1980 Johnson 25hp... weird problem

    Haven't you installed the choke wrong? Is the butterfy open in normal position?

  3. #3

    Default Re: 1980 Johnson 25hp... weird problem

    Quote Originally Posted by Lenard View Post
    Haven't you installed the choke wrong? Is the butterfy open in normal position?
    Yep, the butterfly is operating like it should. I am going to investigate into it a little further. I also had a suggestion from a mechanic at a local boat shop that something is goofed up in the carb causing it to flood. I can assume that even after spraying starting fluid into the cylinders if it is flooding itself that the fluid won't ignite either.

  4. #4
    Join Date
    Sep 2010
    Location
    ontario
    Posts
    9,793

    Default Re: 1980 Johnson 25hp... weird problem

    Disconnect fuel ( to keep it from flooding ) and see if it will start then.------------What is the compressionon this motor ?

  5. #5

    Default Re: 1980 Johnson 25hp... weird problem

    Quote Originally Posted by racerone View Post
    Disconnect fuel ( to keep it from flooding ) and see if it will start then.------------What is the compressionon this motor ?
    Thanks! That is my next plan of action. To be honest, I haven't checked the compression on it in a while.

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