Reply To: OMC 9.5 HP Power head

[Evinrude 25]

Hello Fleetwin,

I clean up the cylinder with light Emery cloth and create and cross hatch pattern (look pretty good on the pictures). I spray both pistons with Sea Foam Deep Creep Lubricant and let sit overnight. Then I install the head with the old gasket on the cylinder (put some OMC gasket sealant around the ring since using old gasket ). I just want to see if the compression jumps up before I order a new gasket. Now the reading is somewhere 58/59 psi for both cylinders (1-2 psi shy under the compression before 60/61 psi). I use the cordless drill to turn the flywheel continuously so it eliminates the cause of the short pull start rope).