What should the compression be for a 4 hp Evinrude 1979 be ?
B b1bofz13 Cadet Joined Jan 29, 2009 Messages 28 Apr 7, 2009 #1 What should the compression be for a 4 hp Evinrude 1979 be ?
R Rick. Captain Joined Jul 30, 2006 Messages 3,740 Apr 7, 2009 #2 Re: compression Both cyoinders should be within 10% of each other. That much I know. The rest of the answer is difficult as methods and gauges will give different readings. Safe to say somewhere between 70 and 120. The higher the better. Rick.
Re: compression Both cyoinders should be within 10% of each other. That much I know. The rest of the answer is difficult as methods and gauges will give different readings. Safe to say somewhere between 70 and 120. The higher the better. Rick.
5150abf Vice Admiral Joined Aug 12, 2007 Messages 5,808 Apr 7, 2009 #3 Re: compression Cold and hot will vary quite alot too, I go from 110 cold to 135 hot so always check it the same so you can compare. the numbers should be as stated.
Re: compression Cold and hot will vary quite alot too, I go from 110 cold to 135 hot so always check it the same so you can compare. the numbers should be as stated.
R R.Johnson Rear Admiral Joined Sep 24, 2003 Messages 4,446 Apr 7, 2009 #4 Re: compression What does your guage say?
