Reply To: 1947 Evinrude Sportwin

[todd281]

Putting oil in the cylinders might raise the compression readings a bit. The oil helps to seal the rings to the cylinders. Having said that, I always put a bit of wd-40 on a new to me motor. If the readings show up good, then I continue with making it run. Once it is up and running, the compression may increase a bit anyway from the rings seating better. So, my two cents is, a squirt of light oil isn’t a bad idea.