Johnson 1989 25hp outboard compression test

[jimboba]

Hi all. I am buying my first boat for my son and have a found good small runabout with a 25hp Johnston outboard. Its had 3 owners and seems to of been really well looked after and flushed in fresh water as every use. The owner mentioned that a compression test was recently done on the last service and came it at 105psi. Does this seem ok for its age? Anything that can be recommeded would be much appreciated.

 

[racerone]

Compression values are not published.----There are too many variables between gauges and test methods.---------The most important thing is that they are the same for both cylinders in your case.--------------Hopefully this motor was never run on 100:1 as some motors were in the late 80's.----------Excellent motors and many were built between 1980 and 2000.----So lots of parts new and used are and will be available for some time to come.

 

[jimboba]

Compression values are not published.----There are too many variables between gauges and test methods.---------The most important thing is that they are the same for both cylinders in your case.--------------Hopefully this motor was never run on 100:1 as some motors were in the late 80's.----------Excellent motors and many were built between 1980 and 2000.----So lots of parts new and used are and will be available for some time to come.

Thanks Mate....much appreciated