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  1. Default 1987 classic fifty backfires and will not crank

    This motor was running fine yesterday at the lake after I shut it down to fish awhile and went to crank it again it started for a few seconds then died and would not crank back. After several tries it started to backfire slightly. Any suggestions?

  2. #2
    Join Date
    Apr 2016
    Location
    barnegat NJ
    Posts
    3,133

    Default Re: 1987 classic fifty backfires and will not crank

    Start with a compression test,second try an open air gap spark test,then move onto fuel diagnostics

  3. Default Re: 1987 classic fifty backfires and will not crank

    Thank you johnnygjr that sounds like a good starting point

  4. Default Re: 1987 classic fifty backfires and will not crank

    Update this motor when cold will crank perfect .i can shut it down for a few seconds and it will crank back perfect. But if I wait 15 minutes it has no fire to spark plugs. Wait about an hour and it will crank right back up. Any help will be appreciated

  5. #5
    Join Date
    Apr 2016
    Location
    barnegat NJ
    Posts
    3,133

    Default Re: 1987 classic fifty backfires and will not crank

    Is your engine running hotter than normal? Could be a heatsink issue,electronics getting overheated then when cooled down work again

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