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Proper compression check?

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    Proper compression check?

    What is the PROPER way to do a compression check?

    #2
    remove all spark plugs, have battery on a booster, screw in compression tester, open throttle wide open and turn engine over until you get the highest compression reading.

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      #3
      I rented a compression tool today but none of the adapters worked except for the hose its self, could not get it tight enough to seal on #2 and #3. So I was getting inaccurate readings. But compression on #1 and #4 is good. Which doesn't help since I need to know compression for #2.

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