Home › Forum › Ask A Member › 1956 Johnson 10hp. QD – 17 Compression › Reply To: 1956 Johnson 10hp. QD – 17 Compression
August 1, 2025 at 4:22 pm
#298710
I would go with the rule of if it runs, it has fine compression. I believe that the concern for compression in multiple cylinder engines of any type is that 1: they have different amounts of compression per cylinder , or 2: they have compression that is concerningly low or nonexistent.
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