compression

[shovelrocker]

Im looking at an 88HP 1990 yr mod Evinrude and would like to know what the compression should be on all 4 cyl?

 

[JB]

Re: compression

With a warm engine, all plugs out and throttle wide open, all cylinders should read over 100psi on a screw-in guage.<br /><br />Most important, the high and low cylinders should be within 15% of each other.<br /><br />Good luck.