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    motor runs great for 1/2 hour, then loses power

    I'm having some problems with my 1979 40HP Johnson outboard model # 40R79E. The motor starts very well, idles and runs excellent for about 1/2 hour, then it loses power and will only run at low throttle. When I open up the throttle more than about 1/4, the motor loses power and stalls. I...
  2. H

    NEED HELP with 1979 40HP Johnson

    Hello, <br /><br />Can anyone tell me the proper spark plug and gap for a 1979 Johnson Workhorse 40 HP? The model # is 40R79E which I believe stands for a commercial 40 horse motor from 1979. However I cannot find any tune up specs for this year and model. The manuals I have checked (Clymers...
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