This accomplish's nothing, except to evaluate the change in cold compression. I recall running a full quart of fuel on one run. It was broken in or very close to it. Ran like a champ. Still have that engine and ran it a few weeks ago. A Fox 35 Stunt. Breaking in is a matter of running it in without overheating it. Nothing more. All of the rest is just to avoid overheating it, or else of no added value.