Merc 150 compression

Trevor1977

Cadet
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Aug 4, 2016
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Can anyone tell me what or where to find the compression numbers for a 150hp 1989 merc outboard is supposed to be
 

Dukedog

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Oct 6, 2009
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115+ would be reasonable with a "KNOWN ACCURATE" gauge. jmo... all should be within 10lbs of each other.. merc doesn't give a specific number for any of their motors....
 

Dukedog

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Joined
Oct 6, 2009
Messages
3,561
115+ would be reasonable with a "KNOWN ACCURATE" gauge. jmo... all should be within 10lbs of each other.. merc doesn't give a specific number for any of their motors....

115 ta 135 isn't to close if ya ask me... jmo. you'll find those numbers in justa bout all 2.0, 2.4, 2.5 manuals.. ​
 
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