Reply To: ‘57 18 hp Evinrude, ‘67 Evinrude power head

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February 12, 2021 at 8:49 pm #230363
Mumbles
Participant

    You should do a compression test with BOTH plugs out and the leads grounded. That motor fired on you and could have started even though it would have been on only one cylinder. In line spark testers are just that, in line, and a motor will run with them hooked up. It probably kicked back on you because you weren’t expecting it to.