compression for a 25hp 1975 evinrude?

boobie

Supreme Mariner
Joined
Nov 5, 2009
Messages
20,826
There are no specs for compression. Cylinders should have no more than 10% variation.
 

Chinewalker

Fleet Admiral
Joined
Aug 19, 2001
Messages
8,902
Typically, you'd like to see somewhere above 100 psi per hole, but this can vary depending on gauge accuracy... That is why there aren't any published specs.
 

nwcove

Admiral
Joined
May 16, 2011
Messages
6,293
i have a 1974 on a stand , with my gauge, it shows 121 bottom, 120 top.
 
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