what is good compression for a 25hp 1975 evinrude? thanks dave
V vidaliaman Seaman Joined Aug 24, 2011 Messages 53 Jul 22, 2014 #1 what is good compression for a 25hp 1975 evinrude? thanks dave
B boobie Supreme Mariner Joined Nov 5, 2009 Messages 20,826 Jul 22, 2014 #2 There are no specs for compression. Cylinders should have no more than 10% variation.
Chinewalker Fleet Admiral Joined Aug 19, 2001 Messages 8,902 Jul 22, 2014 #3 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.
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 Jul 22, 2014 #4 i have a 1974 on a stand , with my gauge, it shows 121 bottom, 120 top.