I have a brand new Tower Pro .46 that has a very tight fit between the piston and cylinder. I put some after-run oil in it to make sure it was well lubed. With a prop installed it can be turned, and I am sure that my electric starter will turn it over when I start the break-in procedure.

Am I correct in assuming (dangerous, I know) that it will loosen up quickly after the initial ignition, when the cylinder and piston start to mate?

Should I put in a lot of after-run oil and remove the plug and turn it over with the starter to help "machine" it a bit to loosen it up before trying to start it?