Compression

H

hal5778

Cadet
Joined
May 28, 2013
Messages
8
Hello I am considering buying a 1997 Mercury 2.0 150hp carbureted 2 stroke. I ran a compression test and the 4 top cylinders read 90lbs and the 2 bottom cylinders read 80lbs. Are these readings acceptable or should they be higher and if so what should they be?
 
JB

JB

Honorary Moderator Emeritus
Joined
Mar 25, 2001
Messages
45,907
Re: Compression

Hi, Hal.

:welcome:

Those are marginal, Hal. Not because of the psi but because of the spread of slightly over 10%. I would have the seller do a decarb and a new compression test. Unless you get a closer spread, pass.
 
C

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
27,149
Re: Compression

You might check the serial number. I had thought the 150HPV6 motors of that year were 2.4L.

I also agree with JB, but it is likely the gauge used read low. You should see over 100PSI on all cylinders.
 
H

hal5778

Cadet
Joined
May 28, 2013
Messages
8
Re: Compression

Thank you to the replies to my concerns it has been helpful in making a decision which was to decline on the purchase and continue looking for a motor
 
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