Re: Evinrude compression

[fisherman6]

The first thing I would check is if both pistons are moving. Pull the spark plugs out and have a look while you rotate the flywheel. If both pistons are moving and compression is 0 on one cylinder, it could be a blown or leaking head gasket. Check the head bolt torque. Loose head bolts could be making the head gasket leak. If it still checks out, remove the bypass cover on the suspect cylinder and have a look at the rings. That could be stuck or broken. Cylinder badly scored, etc. I would try those things first and report back with your findings. The 75psi on the one good cylinder is pretty good compression for a 5.5.
-Ben

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