Reply To: 1971 Evinrude Ski-Twin 40hp spark plug gap closed

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August 21, 2023 at 6:05 pm #279506
MarkD
Participant

    US Member

    I was able to check the compression today in each cylinder and both were 90 psi, which seems pretty good. That there is no difference between the two probably rules out a broken ring. Could a piece break off the piston top as described and not affect the compression? I did look in in the spark plug hole but didn’t see any damage.