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1960 Johnson QD-21..10 hp...good compression??

cjbrill715

Regular Contributor
Hi guys, I recently picked up a 1960 QD-21 10 hp Johnson from a scrap yard, and it runs decent!...I checked the compression at 80 psi both cylinders....Is this decent compression for this motor?....I know larger hp engines you want to be north of 100 psi, wasn't sure about these small displacement motors.
 
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