Mercury 850 (85hp) compression

QBhoy

Fleet Admiral
Joined
Mar 10, 2016
Messages
8,348
hi guys. Not too up on this vintage of motor at all. A friend is going to look at a classic glastron with its original 850. Any idea what the compression should be as a min ? Guessing over 100psi would be acceptable and of course all within 10-15% as per.

Thanks
 
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