compression charts for motors

[tav]

looking at used boat and it has a 2001 merc 125 o/b,,,,,comp. is 95,105,105,100.....yes or no.
are there charts for compression for various motors....thanks

 

[Scott Danforth]

static cranking compression is listed in the manuals

you can view the manuals here http://boatinfo.no/lib/library.html

 

[alldodge]

The rule of thumb is no single cylinder will be more then 10 percent away from the highest. Highest 105 so no lower then 90.5, and it looks like your good for low hour motors. For high hours you can expect 20 percent