Reply To: compression 57 3 hp Johnson

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October 13, 2019 at 2:49 pm #185212
aquasonic
Participant

    Now I think I understand. My previous statement was under the assumption that the one way valve is at the threaded sparkplug hole end of the tester, not at the gauge as others have pointed out. If the volume of the tester hose is included in the measurement then yes, the reading will be lower.

    Congratulations scubachuck on getting your motor running again!

    Improvise-Adapt-Overcome